$\int_0^{\frac{\pi}{2}} \frac{\sin x}{1+\cos ^2 x} dx$ નું મૂલ્ય શોધો.

  • A
    $-\frac{\pi}{4}$
  • B
    $\frac{\pi}{4}$
  • C
    $\frac{\pi}{2}$
  • D
    $0$

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