JEE Math Practice Question

Solution of the differential equation $$\cos x\,dy = y\left( {\sin x - y} \right)dx,\,\,0 < x <{\pi \over 2}$$ is :

1. A.$$y\sec x = \tan x + c$$
2. B.$$y\tan x = \sec x + c$$
3. C.$$\tan x = \left( {\sec x + c} \right)y$$
4. D.$$\sec x = \left( {\tan x + c} \right)y$$