यदि $4 \sin ^{-1} x + \cos ^{-1} x = \pi$ है,तो $x = $

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

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