જો $f$ અને $g$ એ $[0, a]$ માં સતત વિધેયો હોય જે $f(x) = f(a - x)$ અને $g(x) + g(a - x) = 4$ નું સમાધાન કરે છે,તો $\int_{0}^{a} f(x) g(x) dx$ ની કિંમત શોધો.

  • A
    $\frac{1}{2} \int_{0}^{a} f(x) dx$
  • B
    $2 \int_{0}^{a} f(x) dx$
  • C
    $\int_{0}^{a} f(x) dx$
  • D
    $4 \int_{0}^{a} f(x) dx$

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