If $\int f(x) dx = g(x)$,then $\int f(x) g(x) dx$ is equal to
- A$\frac{1}{2} f^{2}(x)$
- B$\frac{1}{2} g^{2}(x)$
- C$\frac{1}{2} [g'(x)]^{2}$
- D$f'(x) g(x)$
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