A.\(\int {\cos 3x\cos xdx}  = \dfrac{1}{2}\left( {\dfrac{1}{4}\sin 4x + \dfrac{1}{2}\sin 2x} \right) + C\)
B.\(\int {\sin 3x\cos xdx}  = \dfrac{{ - 1}}{2}\left( {\dfrac{1}{4}\cos 4x + \dfrac{1}{2}\sin 2x} \right) + C\)
C.\(\int {\sin 3x\cos xdx}  = \dfrac{{ - 1}}{2}\left( {\dfrac{1}{4}\cos 4x + \dfrac{1}{2}\cos 2x} \right) + C\)
D.\(\int {\sin x\cos xdx}  = \dfrac{{ - \cos 2x}}{4} + C\)

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