यदि $\sin ^{-1}\left(x-\frac{x^{2}}{2}+\frac{x^{3}}{4}-\frac{x^{4}}{8}+\ldots\right)=\frac{\pi}{6},$ जहाँ $|x| < 2$ है, तो $x$ का मान ज्ञात कीजिए।

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

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यदि $A = \tan^{-1}x$ है,तो $\sin 2A = $

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