$\int_{-1 / 2}^{1 / 2} \cos ^{-1} x \, dx$ का मान है

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

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$\int_0^{\frac{\pi}{2}} \frac{x \tan x \sec^2 x}{\tan^4 x + 1} dx =$

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