यदि $\int f(x) dx = g(x)$ है,तो $\int f(x) g(x) dx$ किसके बराबर है?

  • 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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