यदि $I=\int_0^{\pi / 2} \frac{d x}{5+3 \sin x}=\lambda \tan ^{-1}\left(\frac{1}{2}\right)$, तो $\lambda=$

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

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