If `y=cos(x+y)," then "(dy)/(dx)=`

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

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

If : sin(x+y)+cos(x+y)=log(x+y)," then: "(dy)/(dx)=

If e^(x+y) =cos (x-y) ,then (dy)/(dx)=

If sin(x y)+cos(x y)=0 , then (dy)/(dx) is

If sin(x y)+cos(x y)=0 , then (dy)/(dx) is

If sin(x y)+cos(x y)=0 , then (dy)/(dx) is

If sin y=x cos(a+y), then (dy)/(dx) is equal to (cos^(2)(a+y))/(cos a)( b) (cos a)/(cos^(2)(a+y)) (c) (s in^(2)y)/(cos a) (d)

If y= cos x^(@), then (dy)/(dx) is?