જો $\frac{d}{dx}\{f(x)\} = g(x)$ હોય, તો $\int_a^b f(x) g(x) dx$ ની કિંમત શું થાય?

  • A
    $\frac{1}{2}\left[f^2(b) - f^2(a)\right]$
  • B
    $\frac{1}{2}\left[g^2(b) - g^2(a)\right]$
  • C
    $f(b) - f(a)$
  • D
    $\frac{1}{2}\left[f(b^2) - f(a^2)\right]$

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