$\int_{0}^{\pi/2} \frac{x + \sin x}{1 + \cos x} dx =$

  • A
    $\frac{\pi}{4}$
  • B
    $\frac{\pi}{3}$
  • C
    $\frac{\pi}{2}$
  • D
    $\frac{\pi}{6}$

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સાબિત કરો કે $\int_{0}^{\frac{\pi}{2}} \sin^{3} x \, dx = \frac{2}{3}$.

$\mathop \smallint \limits_0^\pi \sqrt {1 + 4{{\sin }^2}\frac{x}{2} - 4\sin \frac{x}{2}} \;dx = $

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