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

  • A
    $\pi-2$
  • B
    $\pi+2$
  • C
    $\frac{\pi}{4}$
  • D
    $2 \sin \frac{\pi}{2}$

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