my all-in-one calculus question (uncut)

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  • Опубликовано: 23 дек 2024

Комментарии • 400

  • @blackpenredpen
    @blackpenredpen  3 года назад +518

    Do you like my videos edited or unedited?

    • @jamesh7505
      @jamesh7505 3 года назад +117

      unedited

    • @28sarthakdwivedi44
      @28sarthakdwivedi44 3 года назад +12

      Sir do you conduct zoom meetings also.. please share to me also 😞😞😢😋😋

    • @decCoulissante
      @decCoulissante 3 года назад +14

      Un

    • @mohamedibrahim1023
      @mohamedibrahim1023 3 года назад +15

      Unedited

    • @ArdenChew271
      @ArdenChew271 3 года назад +20

      Unedited but u should speed up erasing and writing way too long things

  • @Luka_D_Snots
    @Luka_D_Snots 3 года назад +1412

    You know things go serious if you see bprp using 5 colors on a question

    • @Claymore_II
      @Claymore_II 3 года назад +71

      Now he’s BPRPBPRPPP

    • @rayane--21pilots8
      @rayane--21pilots8 3 года назад +13

      @@Claymore_II i had a stroke guessing it xD

    • @ananas-nevermind
      @ananas-nevermind 3 года назад +6

      1. that was actually funny
      2. you somehow have about twice as many likes as THE PINNED COMMENT BPRP MADE
      HOW

    • @Luka_D_Snots
      @Luka_D_Snots 3 года назад +3

      @@ananas-nevermind As you can see, many other comments are hearted by bprp. I exchanged the heart for 500 likes.
      jk lol 😂

    • @patolol3091
      @patolol3091 3 года назад

      @@Claymore_II bprpbpppgp
      bp¹=black pen
      rp=red pen
      bp²=blue pen
      pp=purple pen
      gp=green pen

  • @HDitzzDH
    @HDitzzDH 3 года назад +710

    Imagine this question being on your final exam. You go through all of these steps and calculations just to forget the +C at the end which single-handedly causes you to fail the exam.

    • @ranjitsarkar3126
      @ranjitsarkar3126 3 года назад +49

      Bruh you forgor the dx

    • @aadilashraf1597
      @aadilashraf1597 3 года назад +21

      Bro if I am forgetting only the c part in this question...... Then I am sure.... I will be able to solve other questions easily 🤣🤣🤣🤣

    • @marvin5729
      @marvin5729 2 года назад +1

      It's called stuying ET (Elektrotechnic) and IT (Informationtechnic)...

    • @user-yr3uj6go8i
      @user-yr3uj6go8i 2 года назад +6

      Then you have a garbage math teacher/professor if your only mistake of forgetting the +C at the end causes you to fail the entire exam.

    • @memebaltan
      @memebaltan Год назад +1

      @@user-yr3uj6go8i all or nothing

  • @RobinD0903
    @RobinD0903 3 года назад +176

    13:19 LMFAO I FELT THAT “why am I doing this” 💀

  • @baptiste5216
    @baptiste5216 3 года назад +164

    Fermat : "I have discovered a truly marvelous proof of this, which this board is too narrow to contain."
    blackpenredpen : "hold my beer"

  • @SpaceWithSam
    @SpaceWithSam 3 года назад +350

    He’s always energetic and I love it.

    • @morsxsx
      @morsxsx 3 года назад +3

      you can see the passion through his eyes

  • @christopherdyson1158
    @christopherdyson1158 3 года назад +180

    This is completely off topic, but I think I came up with an interesting problem.
    Given the recursive functions:
    f(n) = af(n-1) + bg(n-1)
    g(n) = ag(n-1) + bf(n-1)
    Where a=0.5 and a+b=φ
    Show that both f and g are fibbonacci sequences.
    I'll put my solution at the end.
    Stumbled upon this fact while trying to solve for g for any a or b... idk how others may attempt to solve it but I wrote them as a discrete time convolution. I got this equation for g(n):
    g(n) = (b^2-a^2)g(n-2)+2ag(n-1)
    Was trying to solve for f or g to write sin(nt) in terms of sin(t) and cos(t)... but accidentally made a mistake, one of the equations were supposed to add and the other was supposed to subtract the b term.... was doing this in the first place because, I was hoping the equation for sin(nt) would help solve the integral for (sin(Nt)cot(t/2)+cos(Nt))cos(nt) where N and n are two non-negative integers. Which I plugged into a couple integral calculators... and it didn't give me a solution.
    When you evaluate that integral in respect to t from -π to π, and divide by 2π, its supposed to be an inverse discrete-time fourier transform that should equal 1 for all |n|

  • @xissel
    @xissel 3 года назад +661

    Oh yeah it's just the inverse hyperbolic cotangent of x over the fourth root of 6, I could have guessed that

    • @gusjak3454
      @gusjak3454 3 года назад +36

      For sure🤣🤣❤️

    • @temujinartem2375
      @temujinartem2375 3 года назад +16

      It’s crazy the shit they make you remember in calc but then in any science they give formula sheets longer than the test

    • @MusicalInquisit
      @MusicalInquisit 2 года назад +8

      You forgot the plus c

  • @sfglunywand8042
    @sfglunywand8042 3 года назад +124

    I’m a sophomore in high school and have no idea what he’s doing but I still watch a bunch of his videos because they are interesting and relaxing. Keep up the good work👍

    • @1upGAMeR200
      @1upGAMeR200 3 года назад +6

      Same, I really enjoy these kind of videos :D

    • @aidendoty7711
      @aidendoty7711 Год назад +5

      i was in your position a couple years ago. i’m now in calc 2, watched this whole video and actually understood all of it, and i’m very proud of myself. keep studying and you’ll get there💪

    • @wvr7971
      @wvr7971 Месяц назад

      I did the same thing, been learning from him for a while

  • @toastedbred2961
    @toastedbred2961 3 года назад +172

    You know it's gonna be hard when he doesn't recommend calc teachers to use this in a test at the start of the video

    • @blackpenredpen
      @blackpenredpen  3 года назад +38

      lol

    • @TheRealUSArmy
      @TheRealUSArmy 3 года назад +16

      @blackpenredpen ngl I'd pass out if I saw that question 😳😳

    • @kingshiva5427
      @kingshiva5427 3 года назад

      @@blackpenredpen Challenge in Maths 🏆🏆🔥🔥
      ruclips.net/video/VoZZetC5GfU/видео.html

  • @bavanindhra2733
    @bavanindhra2733 3 года назад +52

    "blackpenredpen"->"blackpenredpenbluepenpurplepengreenpen"
    Peak character development ladies and gentlemen

  • @mohammadmahmood8255
    @mohammadmahmood8255 3 года назад +36

    Limits, derivatives and integration in one question. It should be called fundamental question of the calculus...Complete package.. Amazing

    • @EyeSooGuy
      @EyeSooGuy Год назад

      Don’t forget the sigma!

  • @ranjitsarkar3126
    @ranjitsarkar3126 3 года назад +149

    Wait. Where's the dx?
    That's -100 score for you.

  • @DarshanShah10
    @DarshanShah10 3 года назад +52

    5 minutes for the limit, differentiation and series; and 13 minutes for integration... Well...

    • @comma_thingy
      @comma_thingy 3 года назад +5

      more like 5 minutes to do partial fractions and 3 minutes to do the integral

  • @sdkdoom
    @sdkdoom 3 года назад +23

    I've always wanted to be a teacher, but after watching you, it made me feel so dumb that I'm no longer sure I'm capable of it. I hope I can be as intelligent as you are one day.

    • @gusjak3454
      @gusjak3454 3 года назад +4

      Just keep practicing man. Everything comes on point to the ones who really know what they want. Just giving you some strength ❤️!

    • @jovianarsenic6893
      @jovianarsenic6893 3 года назад +8

      Remember that he’s been teaching for about a decade at a massive institution

  • @Vladimir_Pavlov
    @Vladimir_Pavlov 3 года назад +3

    It is necessary to replace the variable in time to avoid radicals.
    ∫6dx/(x^4-6)=6^(1/4)∫ dt/(t^4-1). t=x/6^(1/4).
    Here the fraction under the integral sign is so simple that it can be decomposed into elementary
    fractions without the method of indefinite coefficients.
    1/(t^4-1)=(1/2) *{1/(t^2-1)-1/(t^2+1)}=(1/2)*{(1/2)[1/(t-1)-1/(t+1)]-1/(t^2+1)}=
    = (1/4)*1/(t-1)- (1/4)*1/(t+1)- (1/2)*1/(t^2+1)

    • @Vladimir_Pavlov
      @Vladimir_Pavlov 3 года назад

      6^(1/4)* ∫ [(1/4)*1/(t-1)- (1/4)*1/(t+1)- (1/2)*1/(t^2+1)]dx=
      = 6^(1/4)* {(1/4)*ln|t-1|-(1/4)*ln|t+1|-(1/2)* atan(t)} +C=
      =(6^(1/4)/4)* ln|(t-1)/(t+1)|-(6^(1/4)/2)*atan (t) +C =
      =(a/4)* ln|(x-a)/(x+a)|-(a/2)*atan (x/a) +C . a= 6^(1/4).

  • @yunghollow1529
    @yunghollow1529 3 года назад +9

    A young man as cool as a Shaolin monk with a Kung Fu Master beard and has a Pokemon ball in his hand explaining math problems... This combination made my yung hollow mind literally explode.

  • @vasnormandy2
    @vasnormandy2 3 года назад +14

    Idk if it’s easier but I factored out the 1/6 on the top and bottom from the beginning to lessen the burden of roots to get 1/((x^4/6)-1).

  • @_CodePro
    @_CodePro 3 месяца назад +1

    First time in history I'm seeing this guy forget the integration dx in the question itself.

  • @3ckitani
    @3ckitani 3 года назад +17

    Ah yes, blackpenredpenbluepengreenpenpurplepen

  • @alberteinstein3612
    @alberteinstein3612 3 года назад +12

    Can you please make a video that introduces hyperbolic functions and some sample problems with them? I’ve never known anything about them and would love to learn more about them!

  • @Chaosdude341
    @Chaosdude341 3 года назад +18

    I like these mega problems! They're great review.

  • @gurpreetkhera8266
    @gurpreetkhera8266 3 года назад +13

    Watching your videos, I actually started loving math !

  • @anupamadewpura
    @anupamadewpura 3 года назад +17

    Heyy I solved this on my own before I went further into the video. I'm proud of myself 😍

  • @hyper_phantom_darxteel
    @hyper_phantom_darxteel 3 года назад +4

    Partial fractions could be used in a different way by adding and subtracting x^2 (x squared) and 6^(1/2) (square root of 6)

  • @polynoodle8186
    @polynoodle8186 3 года назад +3

    Just took my Calculus CLEP exam and got the score I needed; 64 ain't great, but i get my credit so it's cool. I've never been confident in Math, and quite frankly I went into the exam expecting to fail- I'm quite happy that wasn't the case. Im very grateful for all the videos you make, and passing this exam was definitely thanks to you lol. Keep it up!

    • @matthewcaimbeul8722
      @matthewcaimbeul8722 3 года назад

      Never heard of it until looking it up. Seems very silly they wouldn’t just give you the AP Exam.

  • @spaghetti1383
    @spaghetti1383 3 года назад +3

    The partial fraction decomposition can be done without a system of equations if you consider that 1 = 1/(2*sqrt(6))*[(x^2+sqrt(6))-(x^2-sqrt(6))]. This improved memory efficiency allowed me do the problem in my head reasonably fast. Also, BPRP was running out of room and the video was already long so he used hyperbolic trig functions. But you can decompose 1/(x^2-sqrt(6)) with the same trick or Heaviside cover up.

  • @ShebastianReyes
    @ShebastianReyes 3 года назад +143

    This made me realize how much I've forgotten about partial fraction decomposition 🥲 time for a study montage

    • @kruksog
      @kruksog 3 года назад +19

      I got all the way to the integral on my own and said "I do math for fun, but I draw the line at PFD."

    • @stumbling
      @stumbling 3 года назад +14

      STUDYING HARD NOW, HE'S GOTTA RECLAIM
      ALL OF THE MATH THAT ESCAPED FROM HIS BRAIN
      INTEGRALS, DERIVATIVES AND PARTIAL FRACTIONS
      HE'S MASTERED THEM ALL NOW HE'S READY FOR ACTIONNNN
      MATH-E-MATIC!
      AUT-O-MATIC!
      FEELS LIKE MAGIC WHEN YOU DERIVE
      JUST TO STAY ALIVEEEEE!
      MATH-E-MATIC!
      AUT-O-MATIC!
      MATH-E-MATIC!
      AUT-O-MATIC!
      *music fades out as you ride off on a motorcycle*

  • @EyeSooGuy
    @EyeSooGuy Год назад

    I’m 41 and just learning calculus. I just sat there with wide eyes and all shocked at how much work it’s needed. Damn. I think my brain almost literally exploded. Lol.

  • @naeemalqise8978
    @naeemalqise8978 3 года назад

    A technician takes X hours to visit the stores in a couple of streets in one shift, and when he finishes his tour, another technician revisits the same stores again, needing other X hours to finish the second shift, and so on. For example, if the first technician started his shift at 1:00pm, he finishes it at 7:00pm and the second technician starts his shift at 7:00pm and finishes it at 1:00am, and so on. The supervisors used to make a quick meeting with all technicians twice a day at 1:00 am and 1:00 pm, so they need to finish their tours exactly 1:00. Identify the mathematical notation for the number of shifts should be made by the technicians in order to achieve this, write the name of this mathematical value, and find it for two tours, one with X=7 and another with X=11 how I can solve this Question

  • @danny89620
    @danny89620 3 года назад +1

    Thank you I have tears of joy now

  • @dudono1744
    @dudono1744 3 года назад +6

    here is a challenge: find f(x) such that
    f'(x) = f(x+1)
    oh and i forgot something: there is a x such that f(x) = 1 (just multiply the solution by some number to get f(x) = 1 if you don't have it already). This is just to exclude f(x) = 0

  • @eliteteamkiller319
    @eliteteamkiller319 3 года назад

    These are the kinds of questions my General Chemistry I and II professor was fond of - the entire final exam in one question.

  • @adityaadhana5126
    @adityaadhana5126 3 года назад +1

    This guy is gonna change my career!

  • @nicollerodriguez4486
    @nicollerodriguez4486 3 года назад +1

    Your videos are everything

  • @nuranichandra2177
    @nuranichandra2177 3 года назад +1

    An absolute monster

  • @alexanderhjertkvist7537
    @alexanderhjertkvist7537 3 года назад +3

    It makes me so happy to see someone this exited about maths! Keep up the entertaining content😁👍🏼!

  • @enjoylifewithme
    @enjoylifewithme 3 года назад +1

    Integration of 1/sin^7x + cos^7x possible

  • @joseph_soseph9611
    @joseph_soseph9611 7 дней назад +1

    You have a limit, a derivative, a series, but the complicated integral still takes up more than half the time and half the space on the board. Classic.

  • @zhiyuanliu9533
    @zhiyuanliu9533 3 года назад +4

    The final answer can be further simplified into:
    -[(∜6)/2]coth⁻¹[x/(∜6)] - [(∜6)/2]tan⁻¹[x/(∜6)] + C
    however, what if the question is: (Without the restrictions/without the previous infinite series question)
    ∫[6/(x⁴-6)]dx for -∜6 < x < ∜6
    Since coth⁻¹[x/(∜6)] is not defined for -∜6 < x < ∜6, what expression would it be?
    !

  • @eliaspapa4415
    @eliaspapa4415 2 года назад

    I really felt the "Why am I doing this" at 13:20 on deeper levels than is comprehensible.

  • @armanavagyan1876
    @armanavagyan1876 Год назад +1

    More all one calculus questions thanks)

  • @renatotafaj1507
    @renatotafaj1507 3 года назад +3

    The students: "don't worry he said he would put only one ex. on the exam"
    The exercise: are you sure about that 😂😂🤣🤣

  • @WinterSoldier42
    @WinterSoldier42 3 года назад +3

    bro hes getting serious with these problems. I love your videos BPRP. Keep up these amazing videos. Im a high school student in AP Calculus AB. You help me alot with studying! Thanks man!

  • @呂永志-x7o
    @呂永志-x7o 3 года назад

    coefficients can be simplify to -(6)^(1/4)

  • @Prakhar0712
    @Prakhar0712 3 года назад +2

    I lost it at the integration part
    Until then i was really happy that things were going smooth

  • @sultanrespati6673
    @sultanrespati6673 2 года назад +3

    All i know is f(x)=x² so f'(x)=2x

  • @Mystery_Biscuits
    @Mystery_Biscuits 3 года назад +9

    There's no dx at the end of the integral at the top :( xD

  • @ДенисКосько-н9и
    @ДенисКосько-н9и 3 года назад +18

    the very first limit: isn't the definition of derivative?
    derivative of x^(-2) is -2/x^3

    • @someguy650
      @someguy650 3 года назад +4

      Yes u are right. He mentioned it in the video

    • @xinpingdonohoe3978
      @xinpingdonohoe3978 3 года назад +6

      But when it's in first principles form, you should do it as an actual algebra question.

    • @Freddy-pp4nc
      @Freddy-pp4nc 3 года назад +1

      @@xinpingdonohoe3978 why, unless they say you have to why not save time

    • @xinpingdonohoe3978
      @xinpingdonohoe3978 3 года назад +1

      @@Freddy-pp4nc because they are saying to. That is the structure of the question. If it is in first principles form, you need to do it as such. If it's in d/dx form, you can just derive it. With first principles at least you know where you're working to, so it isn't completely abstract algebra.

  • @TitaniumRailgun
    @TitaniumRailgun 3 года назад +1

    I just realized how much more I have to learn

  • @akshatzz_iitb6052
    @akshatzz_iitb6052 3 года назад +6

    At first, this question seemed pretty daunting but when I started solving I thought this question was really simple. I solved inside equations pretty quickly but when I got to the integration I was like "bruh f*ck this shit". In my opinion, the integration isn't difficult, it's just very lengthy.

  • @willbishop1355
    @willbishop1355 3 года назад +1

    Erase part of the board!!! Also at the end, you could simplify square root of 6 / (2 * 4th root of 6) to just (4th root of 6) / 2.

  • @dianeweiss4562
    @dianeweiss4562 3 года назад

    You could have added the dx in the original problem. It was probably written in white.
    Excellent problem. I can solve it today, thanks to what I’ve learned from you over the past few years.
    I may have told you before that as a physicist, my first year of calculus was an “honors” class where all we did was proofs. The only think I really loved about that class was that we used Apostle and I fell in love with proofs by induction.

  • @Audjem1
    @Audjem1 Год назад

    13:26 “why am i doing this”. that’s how i feel when i do implicit differentiation

  • @xChillOutHDx
    @xChillOutHDx 3 года назад +2

    13:19

  • @joannaford7137
    @joannaford7137 3 года назад +4

    Love your content helps with my love of mathematics, regards

  • @eliteteamkiller319
    @eliteteamkiller319 3 года назад +1

    I love how you look at it so proudly when you're done, like it's your child. 😂

  • @marciochs5523
    @marciochs5523 3 года назад +2

    Great content man. As always

  • @lebreizhdu29
    @lebreizhdu29 3 года назад

    Congratulations from a French student. 🇫🇷❤️

  • @buqet
    @buqet 3 года назад +9

    i never thought i would be so satisfied by an math equation :D

  • @myparasan
    @myparasan 3 года назад

    13:19 - My reaction when it's 4 am and I'm only watching these videos

  • @Tank.Dripsey
    @Tank.Dripsey 3 года назад +1

    It's nearly 2am and I've been up for over an hour trying to do this. I lay restless in bed thinking about this question

  • @alexbarac
    @alexbarac 3 года назад

    I may be wrong with the following thought, but here goes: if inside a fraction, both numerator and denominator have the same sign - in our case, both are positive - its absolute value is the fraction itself. Which means that |6/(x^4)|sqrt_4(6), and not |x|>sqrt_4(6).

  • @jibster5903
    @jibster5903 3 года назад +1

    I love this!

  • @mitochondriaman4798
    @mitochondriaman4798 3 года назад +8

    Wait, when solving the Σ, how did x⁴ leave since the fraction is (6/x⁴)'? Shouldn't it be something else?

    • @user-jh3kz7dp2z
      @user-jh3kz7dp2z 3 года назад +5

      he says it's raised to the FIRST POWER, so it's just ^1

    • @xinpingdonohoe3978
      @xinpingdonohoe3978 3 года назад +2

      I don't understand your issue with the series. What's wrong with him answer?

    • @tornadot1182
      @tornadot1182 3 года назад

      I don't really know what your issue is, but I hope this helps.
      The series is a geometric series (of the form a^r, where |a| should be less than 1 for the series to converge. If the series starts from n=1, then the value of the series is a/(1-a).
      If you're confused about the inequality, then it's 6/|x^4|< 1,
      61).
      Hope this helps.

  • @yabbadabbadoo2099
    @yabbadabbadoo2099 3 года назад +1

    isnt (6/x^4)' × x^4 = -24/x ?
    why would it be =6 ?
    it happens at 4:12?

  • @evancamus3322
    @evancamus3322 2 года назад

    just learned what's the derivative of coth^-1. Great video !

  • @yehogwon5667
    @yehogwon5667 3 года назад +2

    06:32 It also can be nice way to use Heavyside cover up method, I guess. :)

  • @sudeepdalbanjan8595
    @sudeepdalbanjan8595 3 года назад +3

    Blackpenredpen Collab with purplepen greenpen and bluepen

  • @cheivan_
    @cheivan_ Год назад +2

    Hey, isn’t the limit just the definition of the derivative of 1/x^2?

  • @W1ndTurbine
    @W1ndTurbine Год назад

    For the first step, the inside of the limit, Couldn't you have used l'hopital's rule to do it quicker? The outcome matches what you got, but I was unsure if the methodology holds up the same

    • @oxydoreduction2483
      @oxydoreduction2483 Год назад

      Why do americans/english people always want to use l'hôpital's rule ??? It's not that efficient, and here, recognizing that you have the definition of the derivative is much quicker. In general, taylor expansions or equivalents are much more useful than l'hôpital's rule, which is quite outdated. I really don't understand why some people only learn to do limits using this rule.

  • @Leo-ws3bp
    @Leo-ws3bp 3 года назад

    If you have 1/(0/1), would that be undefined, or would it be 0 because (a/b)/(c/d)=(a/b)×(d/c) meaning 1×(0/1)=0

  • @citizencj3389
    @citizencj3389 3 года назад

    "Why am I doing this?" Chen Lu contemplating why he is attempting to solve a problem involving almost every core concept of calculus LOL....

  • @richardfredlund3802
    @richardfredlund3802 3 года назад

    Wolfram actually gives me a solution: x = -2 + exp( ( log( t /(t^2 +2) ) *( 1 - t^2 ))/(t^2+1) + log(2)*(1 - t^2) /(t^2 +1) )
    where t:=tan(x/2) and a numeric value of x=2.66536 + 2*n*pi .... maybe because of this video Wolfram updated their algorithm. (it's 6th December now and vid was posted 26th Nov )

  • @Bplayer1113
    @Bplayer1113 3 года назад +1

    Is this ASMR? I get the feels just by watching this

  • @armanavagyan1876
    @armanavagyan1876 Год назад +1

    Your awsome Professor)

  • @radheyshyamsharma1975
    @radheyshyamsharma1975 3 года назад

    its amazing sir.. your videos always enlighten me.....

  • @luccaventurini1011
    @luccaventurini1011 3 года назад

    "Why am I doing this 😞" was the best part 😂😂😂

  • @tacticalcacti7613
    @tacticalcacti7613 3 года назад +1

    Somebody get this man a bigger whiteboard! xD

  • @theactivator3009
    @theactivator3009 3 года назад +1

    Sorry for the stupid question, why ∑ (6/x^4)^n is equals to (6/x^4) / [1 - (6/x^4)] and not to 1 / [1 - (6/x^4)] ?

  • @brunocardin4935
    @brunocardin4935 3 года назад +2

    You're missing a dx after the integral as soon as it starts

  • @mighty8357
    @mighty8357 3 года назад

    You are a madman!

  • @LuchoTorres96
    @LuchoTorres96 2 года назад

    At 10:00 it would be better 6/√6 = √6 and then B=√6/2

  • @VinTheFox
    @VinTheFox 3 года назад +1

    Couldn't you have simplified the answer since √6 / ∜6 = 6^(1/2) / 6^(1/4) = 6^(1/2 - 1/4) = 6^(1/4) = ∜6 ?

  • @dieforyou0077
    @dieforyou0077 3 года назад

    Hello which one is biger e^x and x^n when x->+∞

  • @dr_ned_flanders
    @dr_ned_flanders 3 года назад +1

    What is the minimun number of pen colours a bprp needs to write an equation such that none of adjacent terms have the same colour? Is it like the 4 colour map problem?

  • @raphschru9865
    @raphschru9865 3 года назад

    I think there is an error in the last expression. The red part in factor of coth-1 and tan-1 should be (root4(6))^2 instead of just root4(6).
    So after simplification you get (-1/2)coth-1(x/root4(6)) - (1/2)tan-1(x/root4(6)) + c

  • @tm30shadow_ball
    @tm30shadow_ball 3 года назад

    I'm gonna learn calculus and come back here to see if I can understand more than 20% of this video

  • @kailenties5295
    @kailenties5295 2 года назад

    I feel he did the partial integral in a way that was more work, but it could be the only way. I thought we could just do partial and take g’ = 6, g = 6x, h= (x^4 - 6)^-1, h’ = 0.25ln(x^4 - 6) and the do hg -integral(h’g) for the answer. Why wouldn’t this work?

  • @PimpLink
    @PimpLink 5 месяцев назад

    Ah yes, my favorite episode of blackpenredpenbluepengreenpenpurplepen

  • @28sarthakdwivedi44
    @28sarthakdwivedi44 3 года назад

    Which is greater x^y ! Or y^x ! Given that x and y are real numbers? Pls answer this

  • @Synthesz1
    @Synthesz1 6 месяцев назад

    the "why am i doing this" is so real

  • @LitaroRizo
    @LitaroRizo 3 года назад +3

    Hello sir.
    A friend of mine got an equation he couldn't respond in an exam and i'm sure the solution isn't that hard.
    It's cos(z^2)=-4
    Thank you if you can respond this one 😁

  • @PlutoTheSecond
    @PlutoTheSecond 3 года назад

    When you reduce the fraction at 9:47, couldn't you have canceled out factors of sqrt(6) instead? Then you would have gotten -sqrt(6)/2 with the denominator already rationalized.

  • @TEGPS3
    @TEGPS3 3 года назад

    gonna need this for when i retake calc 2… but on a side note, where did you get the pokeball cover for your mic?

  • @theimmux3034
    @theimmux3034 3 года назад

    In Euclid's proof of infinite primes it is stated that the product of the first n primes plus one is not divisible by any of those primes. Seems intuitive right? Wouldn't it then make sense that also the product of the first n primes MINUS one would also not be divisible by - again - any of those primes? However this isn't true at all. Could you _please_ shed some light onto this problem I am facing?

  • @mostafakhaled9702
    @mostafakhaled9702 3 года назад

    hello bprp. there's a limit that's been puzzling me for a while: lim(x,y)--->(0,0) (xy^3)/(x^2+y^6)
    if you try many directions like polynomail functions or y=sinx or y=e^x-1 the limit = 0 but if you saw the graph for that two variable function you see that the limit does not exist at (0,0) so from what direction is the limit not equal to 0?

  • @destroyerprime2011
    @destroyerprime2011 3 года назад +2

    How about 10 questions in one??

  • @vihaankharia2829
    @vihaankharia2829 Год назад

    at 9:12 wouldn't that be equal to -6 and not 6

  • @mrjazz2570
    @mrjazz2570 3 года назад

    Hey blackpenredpen, i have a problem ive tried to solve, but no answer yet. It goes like this
    LOGa(x) = a^x , you need to solve for an a value so tangency occurs (both equations kiss eachother)
    Ive got the value to be about 1.45, but its not satisfying to estimate it lol
    Thanks:)