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If cosy=xcos(a+y)" with "cosa!= +-1, the...

If `cosy=xcos(a+y)" with "cosa!= +-1`, then `dy/dx` is equal to

A

1.`(sina)/cos^(2)(a+y)`

B

2.`cos^(2)(a+y)/(sina)`

C

3.`(cosa)/(sin^(2)(a+y))`

D

4.`cos^(2)(a+y)/(cosa)`

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The correct Answer is:
B
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