यदि $f(x) = \int_{\pi^2/16}^{x^2} \frac{\sin x \cdot \sin \sqrt{\theta}}{1 + \cos^2 \sqrt{\theta}} \, d\theta$ है,तो $f'(\frac{\pi}{2})$ का मान ज्ञात कीजिए।

  • A
    $\pi$
  • B
    $-\pi$
  • C
    $2\pi$
  • D
    $0$

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