\(\int {\sin x.\cos xdx} \) bằng:

Câu hỏi: \(\int {\sin x.\cos xdx} \) bằng:

A \(\dfrac{{\cos 2x}}{4} + C\)

B \( - \dfrac{{{{\sin }^2}x}}{2} + C\)

C \(\dfrac{{{{\sin }^2}x}}{2} + C\)    

D \(\dfrac{{{{\cos }^2}x}}{2} + C\)