Cos Rule grade 11: Introduction

[@sour_mister]

Sir can we not find T using the sine rule though?

[@kevinmathscience]

Yes of course you can Karabo 😀

[@phumzilenxumalo8398]

But sir we do not have both angles

[@nthabisengngomezulu6426]

@@phumzilenxumalo8398 but we do have the sides

[@samantha_sammyyy]

On the second equation you can use the sine rule to find T thou🤔

[@heidin406]

right!? then you use that to find angle W (sum of angles in a triangle) then you use the cos rule to find X. right?

[@mtumiemokoena]

thanks mr kevin

[@KatangaCatchtv]

Thanks braa

[@kevinmathscience]

Pleasure!

[@thapelomositsa6761]

Hi Sir can you please make more videos for statistics grade 11

[@MukotisiMabasa]

Thank you soo much Kevin. But I have a question when using the sin rule how will you know if it's an ambiguous case or not

[@RabbitRay-eh3xe]

its normally when after simplifying it looks like a trig equation you would get when asked to solve general solution. like sin(x)=6.7 or something similar where you get the ref angle and solve

[@mukutsur8886]

Sir can you please do a video of proving cosine rule with an obtuse angle

[@SA_talenthttps-vg9tn]

Even if it's not the obtuse angle all angles in general
And also proving the sine rule

[@_s.b.u.d.a]

How Did You Solve For X?

[@MukotisiMabasa]

Using the quadratic formula

[@unathirejoice2638]

you are amazing 🥰🥰

[@ethanbillett2222]

Life saver

[@kevinmathscience]

Glad it helped!

[@melokwakhekhumalo2395]

Is proving it important?

[@kevinmathscience]

They do sometimes ask it in a test but hardly ever :)

[@IAMBATMAN...]

We always asked to prove a rule💀

[@phumzilenxumalo8398]

Hello sir
How do i proof the cos rule

[@ThamiTamiaya]

Sir can u send me some work out of cos rule

[@gamez.4810]

jy kevin u dont fortcha for me sien jyy