Step 1 :\( \frac{\cos x + 1}{\sin^3 x} = \frac{1}{\sin x (1 - \cos x)} \)
Step 2 :\( (\cos x + 1)(1 - \cos x) = \sin x \)
Step 3 :\( \sin^2 x = \sin x (1 - \cos x) \)