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

If `y = cos (x + y)`, then `(dy)/(dx)` =

A

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

B

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

C

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

D

`(sinx+siny)/(cosx-cos y)`.

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