$\int_{\pi /4}^{3\pi /4} \frac{dx}{1 + \cos x}$ का मान ज्ञात कीजिए।

  • A
    $2$
  • B
    $-2$
  • C
    $\frac{1}{2}$
  • D
    $-\frac{1}{2}$

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