यदि $\tan ^{-1}\left[\frac{\sqrt{1+x^2}-\sqrt{1-x^2}}{\sqrt{1+x^2}+\sqrt{1-x^2}}\right]=\alpha$ है,तो $\sin 2 \alpha$ का मान ज्ञात कीजिए।

  • A
    $x^3$
  • B
    $\sqrt{x}$
  • C
    $x$
  • D
    $x^2$

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