यदि $\cos ^{-1} x = \sin ^{-1}(3x)$ है,तो $x$ का मान ज्ञात कीजिए।

  • A
    $\frac{\sqrt{10}}{10}$
  • B
    $\frac{\sqrt{5}}{5}$
  • C
    $\frac{5}{2\sqrt{6}}$
  • D
    $\frac{-\sqrt{10}}{10}$

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