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

Question

( A ) $\tan x = (\sec x + c) y$
( B ) $y \tan x = \sec x + c$
( C ) $\sec x = (\tan x + c)y$
( D ) $y \sec x = \tan x + c$