If $4 \sin ^{-1} x + 6 \cos ^{-1} x = 3 \pi$,then $x = \ldots$.

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

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