જો $y = 1 + x + \frac{x^2}{2!} + \frac{x^3}{3!} + .....\infty$ હોય,તો $\frac{dy}{dx} = $

  • A
    $y$
  • B
    $y - 1$
  • C
    $y + 1$
  • D
    આમાંથી કોઈ નહીં

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