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If siny=xsin(a+y) , then (dy)/(dx) is ...

If `siny=xsin(a+y)` , then `(dy)/(dx)` is
(a)`(sina)/(sina sin^2(a+y))`
(b) `(sin^2(a+y))/(sina)`
(c) `sina sin^2(a+y)`
(d) `(sin^2(a-y))/(sina)`

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