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

  • A
    $\frac{2x}{\sqrt{1 - x^2}}$
  • B
    $\frac{2x}{1 - x^2}$
  • C
    $\frac{2x}{1 + x^2}$
  • D
    इनमें से कोई नहीं

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