$0 < \alpha < \pi$ માટે નિશ્ચિત સંકલન $\int_0^1 \frac{dx}{x^2 + 2x\cos \alpha + 1}$ નું મૂલ્ય કેટલું થાય?

  • A
    $\sin \alpha$
  • B
    $\tan^{-1}(\sin \alpha)$
  • C
    $\alpha \sin \alpha$
  • D
    $\frac{\alpha}{2 \sin \alpha}$

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