$\int_{-1 / 2}^{1 / 2} \cos ^{-1} x \, dx$ નું મૂલ્ય શોધો.

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

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