જો $\sec ^{-1}\left(\frac{5}{x}\right)+\sin ^{-1} \left(\frac{4}{5}\right)=\frac{\pi}{2}$,જ્યાં $x \neq 0$,તો $x=$ . . . . . . .

  • A
    $3$
  • B
    $1$
  • C
    $5$
  • D
    $4$

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