If sin y=x sin(y+a) and (dy)/(dx)=(A)/(1...

If `sin y=x sin(y+a)` and `(dy)/(dx)=(A)/(1+x^(2)-2x cos a)` ,then the value of `A` if x=0 and y=0 is
(A) `2`
(B) `cos a`
(C) `sin a`
(D) `sin2a`

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