Integrate : $ \int \sin ^3 x .dx$

Question

\[\begin {array} {1 1} (a)\;\frac{3}{4}\sin x -\frac{1}{12} \sin 3x +c\\ (b)\;\frac{-3}{4} \cos x +\frac{1}{12} \cos 3x +c \\ (c)\;\frac{3}{4}\cos x +\frac{1}{12} \cos 3x +c \\ (d)\;None \end {array}\]