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

Question

Solution of the differential equation

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

$y\sec x = \tan x + c$

$y\tan x = \sec x + c$

$\tan x = \left( {\sec x + c} \right)y$

$\sec x = \left( {\tan x + c} \right)y$

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