If `sin y=x sin(y+a)` and `(dy)/(dx)=(A)/(1+x^(2)-2x cos a)` then the value of `A` is

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

If y,=x sin y, prove that (dy)/(dx),=(sin y)/((1-x cos y))

If sin y=x sin(a+y), then show that: (dy)/(dx)=(sin a)/(1-2x cos a+x^(2))

If sin (x+y) +cos (x+y) =1,then (dy)/(dx)=

if y=(sin x)^(cos x). Then (dy)/(dx)=

if y+cos y=sin x , (dy)/(dx)=

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

If y = x sin y prove that (dy) / (dx) = (sin y) / ((1-x cos y))