જો $\cos x = \frac{1}{\sqrt{1 + t^2}}$ અને $\sin y = \frac{t}{\sqrt{1 + t^2}}$ હોય,તો $\frac{dy}{dx} = $

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

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