$\int_0^{\pi / 4} \frac{1}{5 \cos ^2 x+16 \sin ^2 x+8 \sin x \cos x} d x=$

  • A
    $\operatorname{Tan}^{-1}\left(\frac{4}{5}\right)$
  • B
    $2 \operatorname{Tan}^{-1}\left(\frac{3}{5}\right)$
  • C
    $\frac{1}{8} \operatorname{Tan}^{-1}\left(\frac{8}{9}\right)$
  • D
    $\frac{1}{4} \operatorname{Tan}^{-1}\left(\frac{7}{8}\right)$

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