$\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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यदि $a > 0$ है, तो $\int_{-\pi}^{\pi} \frac{\sin^2 x}{1+a^x} dx$ का मान ज्ञात कीजिए।

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कथन $(A): \int_{-a}^a f(x) dx = \int_0^a (f(x) + f(-x)) dx$
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$\sum \limits_{n=0}^{1947} \frac{1}{2^n+\sqrt{2^{1947}}}$ का मान किसके बराबर है?

$\int_0^{\pi / 2} \frac{1}{1+\tan ^{2020}(x)} d x=$

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