यदि $\int \frac{1}{\sqrt{9-16 x^2}} d x=\alpha \sin ^{-1}(\beta x)+c$ है,तो $\alpha+\frac{1}{\beta}=$

  • A
    $1$
  • B
    $\frac{7}{12}$
  • C
    $\frac{19}{12}$
  • D
    $\frac{9}{12}$

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