If y + sin y = cos x, then (dy)/(dx) is...

If ` y + sin y = cos x, then (dy)/(dx)` is equal to

A

`( sin x)/( 1 - cosy)`

B

`- (sin x)/( 1 + cos y)`

C

` - ( cos x )/( 1 + sin y)`

D

`( cos x)/( 1 - sin y)`

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The correct Answer is:

B

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