Q .     If `sin^2 x + cos^2 y = 1`, then `(dy)/(dx)` is equal to

UPSEE 2014
A

` (sin 2x)/(sin 2y)`

B

` (sin^2 y)/(sin 2x)`

C

` (sin^2 x)/(sin^2 y)`

D

`- (sin^2 y)/(sin^2 x)`

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