मान लीजिए $f(x) = \frac{\sin x}{x}$,तो $\int_{0}^{\frac{\pi}{2}} f(x) f\left(\frac{\pi}{2} - x\right) dx =$

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

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