જો $\int_{0}^{a} \frac{dx}{1+4x^{2}} = \frac{\pi}{8}$ હોય,તો $a =$

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

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$\int_0^{\pi} (\sin^2 \frac{x}{2} - \cos^2 \frac{x}{2}) dx = $ . . . . . . .

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