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## shivamsinha 3 years ago plzz help me now....... if cosy=xcos(a+y) theprove that dy/dx=(cos^2 (a+y))/sina

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1. shivamsinha

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

2. dumbcow

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

3. dumbcow

then im guessing use sum of angles formula

4. dumbcow

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

5. shivamsinha

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

6. dumbcow

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

7. shivamsinha

ywesssss it shud b sry it din write

8. shivamsinha

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

9. shivamsinha

*pellettt

10. shivamsinha

*pelletttt

11. shivamsinha

***crap...

12. shivamsinha

censorship even here??? :P

13. dumbcow

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

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