यदि $\tan y = \frac{2t}{1 - t^2}$ और $\sin x = \frac{2t}{1 + t^2}$ है,तो $\frac{dy}{dx} = $

  • A
    $\frac{2}{1 + t^2}$
  • B
    $\frac{1}{1 + t^2}$
  • C
    $1$
  • D
    $2$

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