$\int\limits_{ - \pi /2}^{\pi /2} {\frac{{{{\sin }^2}x}}{{1 + {2^x}}}dx} $ का मान क्या है?

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

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