Find the value of A and B if int(sinx/sin(x-alpha))dx=

Question

$\int \frac{sinx}{sin(x-\alpha )}dx=Ax+B\log \sin (x-\alpha )+C$ 

(a) (sin α, cos α)

(b) (cos α, sin α)

(c) (- sinα, cosα) 

(d) (-cosα, sinα)