Trick for doing trigonometry mentally!
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- Опубликовано: 2 мар 2015
- This fast math trick can be used to mentally work out the main basic trigonometric ratios instantly! With this fast mental math technique you can work out the sin, the cos, and even the tan of the most common angles in no time at all! Become the trigonometry master!
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This guy is literally saving millions of people’s future by being better at math
I know.
I don’t get it
1000% true
Yes bro😭😭
@@naimakhan2574 😱😱😵😵🦹🦹🦹
29 year old civil engineering student... never heard of this. This is gold.
I KNOW DUDE!
Haha same here 😂
Same! Best of luck.
Also, how bout you sailors let us soldiers win at football?
😂😂😂👍👍👍
tell me about your job. is it good. i am interested in engineering
6 hours till my final, RUclips works in a mysterious ways
God*. Yes he does
Make that 17 hours till my 8th grade entrance exam
@@rimasdiaa7181 did you make it? those are so hard
@@1lovebaking turns out they gave us a late notification due to the fact they DON'T want us to study, they just want to test my competence so.. yeah
@@rimasdiaa7181 oop-
I know a trick my friend made up. If you are trying to fill in a unit circle for degrees, than say, "30, 15, 15, 30, 30, 15, 15, 30." Until you are done filling it out. It would look like this on the circle: 30, 45, 60, 90, 120, 135, 150, 180, 210, 225, 240, 270, 300, 315, 330, 360. Keep adding 30 then 15 then 15 then 30 until you get to the end. Hope this helps.
Pls make a video on this trick🥲
What is the end goal in this “trick”? 🤔
@@gacalka this trick is just an easy way to write all of the degrees for the unit circle from 0 to 360.
If you fill out the radians of the circle first, then you can see what radian is equal to which degree.
@@MonkeyGoatLicker wouldn’t it also be easy to use a calculator then if it’s filling a whole table?
Wait, how are the values of the sines, cosines, and tangents of those angles obtained? By use of mind trick or a calculator?
@@gacalka this trick is used to figure the angle numbers. Look up on Google: "The Unit Circle" for a good example. If you want to find sin, cos, and tan then look at coordinates points. Example: (1/2, √3/2) or (0, 1)
I cried from stressing myself trying to study this for my quiz tomorrow morning, found this video & now I just wanna give you a hug for helping me out. Thank you so much for this video! Keep up the good work!
Do you still remember your comment.now😊
@Yeet Feet 2 haha yes thats was my ques too
@kltcbp do u still remember this 😅🤗
😂
It's been 4 years..what are you doing now?
SIN=RIGHT
COS=LEFT
very nice
yes very
Omg u r *sin* !! Thank you.
You have *cos* a important comment
If u don't understand...Use sin = right and cos = left
That helped
@@divyabais4911 Yo why does your picture move when I scroll pass it quite fast?
He sounds like a flight attendant omg
With a stuffy nose. Haha
Stop using obscene language
Why are you crying tho
Sloogle
He’s an overreactive hooman that uses emojis too often
Set the speed slow
“I’m not the greatest artist” every Four year old disagrees
😂😂
"Handy little trick" xD
k dramA FAN?
ME TOOOOOO YOUR PROFILE ITS THE POSTER OF THE K DRAMA SCARLET HART REYO!!! MOON LOVERS !!!1
come on dude dont be a pussy writing things that dont matter.its commonplace to be one with nature
Wish I could dislike a comment just for the cringe
Quite handy
Well, you can
So, the Tangent would be the number of fingers on the right of the degree divided by the number of fingers on the left of the degree, and then the square root of that, i.e., the TAN of 60 would be sqrt (3/1); the TAN of 45 would be sqrt (2/2); the TAN of 30 would be sqrt (1/3).
awesome
Anyone else look this up for yr11 revision?
Year 10 but yeah
Ok dont be dissapointed, year 7
Well can someone explain what YR 7 10 or 11 means
In my country we use grade like grade 7 is grade 7 = yr 7
@@PyrusDrago16 Bruh we not talking bout grades,we talked about what year we are in so u are in year 11 then you are in yr 11
@@PyrusDrago16 year 10 means the grade u study in. So if u r 15 years old, you would be in year 10 (for u u call it grade 10)
What kind of sorcery is this!!! Where were you my whole life?
what if I don't have 5 fingers :)
Use your toes
+Jodex what if I don't have toes :)
Then use whatever you used to reply to my comment.
A smart phone? Then Positive yes would be disqualified!
A A Oh well...his loss, he better buy a damn calculator.
Your channel deserves more respect. Thanks for this.
I think it would make more sense to number the fingers 0,1,2,3,4 - clockwise for cosine, counterclockwise for sine.
Then, just take the square root of that number over 2.
mdiem This makes more sense!!!! 😁👍🏾
Wow ure Soo ryt
You should make a video probably.
Tnx
IQ=100000000000000000000000000000000000000000
Lmao,this appeared in my recommended just as i ve finished my trigonometry homework
It's creepy 😨
@@Muhammad_Waleed it's youtube
@@jiminbang5822 Once I just talked about Money Hiest with my Friend I haven't even watched it.....
But I randomly got 2,3 Videos about Money Hiest reviews in my Recommendations.
Lol ✌️
@@Muhammad_Waleed dundundun
Amazing! I know them perfectly for my exam tomorrow! Thank you so so much
This saves me so much time.... I always draw out two triangles and solve it that way. Nice trick!
This is pure gold, I can’t thank you enough 🙌🏼
40 % saying thank or he is god
30% talking about his voice
30% is talking about 45* finger
Muhammad Sahil ☝️
I think you are right. It's the bad apple at the end of the spectrum disorder such as autistic ppl or with special needs. 🤭🤭🤭
These percentages are wrong. There should be a percentage of those who commented about other comments😏
It's good video. ....
loooollll
Dat hand on fleek tho
lol !
Moonlight Glimmer I'm dead.😂😂😂😂😂 can't stop laughing. Omg!! somebody helllp!!
Or you could memorize the values.
HAHAHAHA
🤣🤣🤣🤣🤣💔💔💔
2:00 sin is on the left side of the hand then, you switch it two sin is on the right instead of the left side of the hand
It's a great trick, I'll improve it a bit before explaining to my students .Thanks for giving the idea.
THIS IS AMAZING! THANK YOU!
The videos from 6 years ago still work
PUG IT!
Thank you! This makes my pre-calculus final tomorrow moderately less stressful! :D
Yes like the left hand trick for Sine. Love this one also, but it’s more like the 9 times multiplication table trick which uses both hands. Math rocks!! Tfs! 😘✨👍🏾
Excellent. Simple way.
Very inspiring. Thank you.
There are several ways to make things easier. You could remember the Sin() values in order from Sin(0) to Sin(90) as sqrt(x/4) with x varied from 0 to 4, then the Cos() would be the same values but invert their order. Afterwards Tan() is just solving Sin()/Cos().
Another way is to visualize rows for Sin() and Cos(), Sin() on top, with 30, 45 and 60 degrees as columns, then fill it left to right starting from top left "1,2,3, 3,2,1 ", divide everything by 2 and the numerators get a sqrt except for the ones with 1. You won't get values for 0 or 90 degrees but those are easy if you understand what Sin() and Cos() are on the trig circle.
My life before and after this video is not the same. Huge thank you !
This trick is unbelievable! It has cleared all my doubts of never being able to learn this topic. Thank you sir.
This is really helpful, thank you so much 🌺
Wish i knew this back in high school, would have made things so much easier...
thanks m8 it is very helpful
Omg thank you so much! I never thought I’d be able to memorize this stuff so fast!! 🎉😮
I was in a real worry about thinking these sin, cos and tan but today it had faded awy. Thanks a lot sir, from bottom of my heart🥺❤️🙏
RIP people without hands
lmao don't cancel me it's a joke guys
🤣🤣😂theres always that one guy
Where was this when I was failing my math exam two years ago
just wow. Mind truly blown. This trick is living rent free in my head now.
THANK YOU!! This is a Godsend for my maths non calc gcse tmr!!
You got the last one reversed. It was 45°, so it didn't matter, but you went left for sin and right for cos.
at first i was so confused still a saw the answers were the same
Just switch hands.
Russell Campbell I
You get how the method works which means he did his job. 😂
This dude has confused me beyond belief
If you really want to learn you should visit www.udemy.com/trignometery-for-any-competitive-exam-based-on-academics/?couponCode=HURRYGRAB10.this course is for free but limited offer
you're confused? i am too
You're
not alone
😂
😂😂😂
If I start doing this in an exam it's going to look like an advanced form of communication or like I'm trying to do a spell.
helped a lot, sir. Thank you.
Well detailed lecture. I've just started my maths RUclips channel and hope to learn from you on how to grow it
Great, now I need all of my fingers! Math eludes me once again.
Dude, so helpful, Thank you very much
Thanks for this, very helpful.
“So going from left or right we will name the angles...” *goes right to left*
Hes from Australia (accent) so everything is inverted. 🙃
FYI this does the whole circle, this is just the first quadrant. Only thing that changes is the signs (+ or -). If the x values are negative then the cosine is negative, and if the y values are negative than sine is negative. So figure out the quadrant and slap on the right negatives and you can do any angle not just up to 90.
@@kipskip_1203 yes it is the same other than the sign. You can put it in you calculator to double check if you need. Supplementary angles will always give you the same sin and cos just with a different sign ( + or - ) depending on the quadrant the angle ends in. For 135 degrees it is in the second quadrant so the cos will be negative because the x axis is negative, but the sin will stay the same because it is the same positive y value. 225 degrees will return the same value as well, but both sin and cos will be negative because the x and y values are negative in the bottom left quadrant.
Thanks dude!!! It's very helpful
I love this guy he use smart way to teach Math. His English sounds like Australian yet a lot easy for me I really want to talk to him one day.
You sir just saved an engineering student.
"Oh my..I do say! That hand does appear to be flipping us off, sir."
Awesome resource to learn this very handy trick. Well taught.
Too amazing! Super thankful!!!!
awesome trick. I wish I knew this earlier...
Visakh M.S
For now tricks join Maths Techy
Watch videos once
I'm studying for A/L's these days. This looks like a nice 'handy little trick', but I feel like remembering those values is better and simpler 😅 Anyway this is useful indeed when we're forgotten any of those values.
I agree, just remembering the values are much easier and more meaningful.
Thanks for this helpful video 😊
Thank you for the message
havent even watched just heard "gday" and now im subscribed
i love math again thank u so much
+german cahuantzi Agreed! This was an awesome lesson. I've never seen this strategy used for trig.
I want to thank RUclips for recommending this needful video❤️💕
Love you, man.
As an university student that's studying math, I owe you my life
Damn. Wish a was taught this way during my school days in the 80s. Maths teachers never taught anything like this. Oh,how times have changed.
They don't teach like this still
@@ok-xk2rr my teacher taught me that. I am in an international school
THIS IS AMAZING THANK YOU SO MUCH!!!!!
Hats off to this guy
I wanna say thank you for this absolute content. saving me from tons of memorizations.
just little petty mistke but got it though.
Poor people with polydactyly :(
i dont see what the problem is just cut it off lmao
@Trimplum14 im fine
Thank you for this
You are the goat . Thank you so much
Who all didn't understand
You're on your own buddy
Do you understand now
@@Danymillionu doing gcses bro?
@@notsurefornow69 what does gcses mean
@@Danymillion nvm
I just try to remember that cos(30) = sqrt(3)/2 is the distance on the x axis and has to be larger than cos(60) = 1/2 since 30 degrees is closer to 0 degrees and cos(0)=1
Simplest trick yet so effective - Life saver :)
thankyou so much for this
So you’re telling me this has existed while I’ve been memorizing trig triangles for my whole life
thanks sir
RANDOM GAMING
If u want more maths trick.. Subscribe Maths Techy
Great video! Thanks a lot.
Very helpful. Thank you
Thank you for this, this Hand trick is pretty...HANDY ;)
🤣🤣
Thanks ,cause is like my daughter we be the best in class now
Amazing! Subscribed
thank u brother maths amazed me once again
Love the trick but his voice sounds like he has cold and is making me feel uncomfortable idk why😕
Turn on your captions
Australian lol
its bruce from finding nemo
YEAH HE'S GOT THAT CONGESTED VOICE XD
A bit like me, one reason is the mic, and another reason is because he got a runny nose all the time, as he got noseallergy.
This is like effort, I just remember the exact values triangles
Even after 8 years. This is still Gold
Thanks a lot❤❤❤❤❤❤❤❤❤❤
THANK YOU SO MUCH.
I prefer the equilateral triangle with length 2 and splitting in half to find the values
Sam M side length 2 or altitude of 2?
gr1nder07 Side length 2 giving a perpendicular height of root 3.
Doesn't work for 45 degrees though.
Where can i buy one of these?
what? hands? idk, dark web I guess
@@captainobvious.29yearsago70 I kid you not i have NO memory of writing this comment lol. No idea how wasted i must have been.
That is an incredibly “handy” trick! I wish I had known of it back in… 1985. :) THANKS!
This is really very cool & helpful
Thanks a lot
Tecmath doesn't follow his own directions at 4:20.
When finding sin, he's counting all the fingers on the Left side of the finger to arrive at sin, but elsewhere it is those fingers to the right.
Follow the directions in the first part of the video, and skip the last minute.
If you're finding Cos, count the # of fingers to the LEFT ... if you're finding Sin, count the # of fingers to the RIGHT.
The sine and cosine value of 45 are the same (as you can see, there are an equal number of fingers on the left and right side of your middle finger), so it didn't really matter which side he used, although he was technically not following his own rule, he wasn't wrong.
That's cause 45 degree is the centre n so doesn't matter
That's true
You’re right *coughs coughs* totally get what you’re trying to say
I spent 30 years of my life designing metal structures, I never needed these values.
9 years later still helping a lot....
Nice, a very good trick to have on hand.
Dad joke. I love it!
i wish i knew this earlier :I
candh same
Was he flipping me off, no, just on a tangent.
You win. Nice.
Thank you so much!
Useful trick to remember trigonometric values thank you so much.