shivamsinha
plzz help me now.......
if cosy=xcos(a+y) theprove that
dy/dx=(cos^2 (a+y))/sina



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

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

dumbcow
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then im guessing use sum of angles formula

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

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

dumbcow
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i don't know if im helping :
there should be a dy/dx with the sin(a+y)x term

shivamsinha
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ywesssss it shud b sry it din write

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

shivamsinha
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*pellettt

shivamsinha
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*pelletttt

shivamsinha
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***crap...

shivamsinha
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censorship even here??? :P

dumbcow
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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