જો $4 \sin ^{-1} x + 6 \cos ^{-1} x = 3 \pi$,જ્યાં $-1 \leq x \leq 1$,તો $x =$

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

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