यदि $\cos (2\sin ^{ - 1}x) = \frac{1}{9}$ है,तो $x = $

  • A
    केवल $\frac{2}{3}$
  • B
    केवल $-\frac{2}{3}$
  • C
    $\frac{2}{3}, -\frac{2}{3}$
  • D
    न तो $\frac{2}{3}$ और न ही $-\frac{2}{3}$

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