જો $4 \cos^{-1} x + \sin^{-1} x = \frac{\pi}{2}$ હોય,તો $x =$ . . . . . . .

  • A
    $1$
  • B
    $\frac{\sqrt{3}}{2}$
  • C
    $0$
  • D
    $\frac{1}{2}$

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