$\int_0^{\pi /2} {\sin x\,\sin 2x} \, dx$ નું સાચું મૂલ્ય શોધો.

  • A
    $\frac{4}{3}$
  • B
    $\frac{1}{3}$
  • C
    $\frac{3}{4}$
  • D
    $\frac{2}{3}$

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$\int_{\pi /6}^{\pi /4} \text{cosec} \, 2x \, dx = $

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