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if sin y = x cos (a + y) , then (dx)/(d...

if sin `y = x cos (a + y) , ` then `(dx)/(dy)` is

A

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

B

`(-cos a )/(cos^2 (a+y))`

C

`(cos a)/(sin^2 y)`

D

`(-cos a)/(sin^2 y)`

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