यदि $\sin ^{-1}\left(\frac{x}{5}\right)+\operatorname{cosec}^{-1}\left(\frac{5}{4}\right)=\frac{\pi}{2}$, तो $5+x=$

  • A
    $6$
  • B
    $5$
  • C
    $7$
  • D
    $8$

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