જો $\cos (2\sin ^{ - 1}x) = \frac{1}{9}$ હોય,તો $x = $

  • A
    માત્ર $\frac{2}{3}$
  • B
    માત્ર $-\frac{2}{3}$
  • C
    $\frac{2}{3}, -\frac{2}{3}$
  • D
    $\frac{2}{3}$ કે $-\frac{2}{3}$ બંનેમાંથી એક પણ નહીં

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