જો $3 \cos ^{-1} x + \sin ^{-1} x = \pi$ હોય,તો $x = $ . . . . . . .

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

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