यदि $\int_0^{\pi / 2} \frac{d x}{5+4 \sin x}=A \tan ^{-1} B$ है,तो $A+B=$

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

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