Question

plzz help me now.......

if cosy=xcos(a+y) theprove that

dy/dx=(cos^2 (a+y))/sina

Answer 1

i jst dbtknw ...y i g8 stuck wit simple sums....:(

Answer 2

using implicit differentiation:
\[\frac{dy}{dx} = \frac{\cos(a+y)}{x \sin(a+y)-\sin(y)}\]

Answer 3

then im guessing use sum of angles formula

Answer 4

sin(a+y) = sin(a)cos(y) + sin(y)cos(a)

Answer 5

\[shouldnt ittt be -\sin(y) dy/dx =-\sin(a+y)x+coas(a+y)\]

Answer 6

i don't know if im helping :|

there should be a dy/dx with the -sin(a+y)x term

Answer 7

ywesssss it shud b sry it din write

Answer 8

pellet....yes u r write....mdumb :P

Answer 9

*pellettt

Answer 10

*pelletttt

Answer 11

***crap...

Answer 12

censorship even here??? :P

Answer 13

haha
from here though im not sure where to go, they don;t have an x in their answer ...i don't see how the x cancels anywhere