જો $y = \frac{1}{x} + \cos 2x$ હોય, તો $\frac{d^2y}{dx^2}$ ની કિંમત શું થાય?

  • A
    $\frac{2}{x^3} + 4y - \frac{4}{x}$
  • B
    $4y - \frac{4}{x} - \frac{2}{x^3}$
  • C
    $\frac{2}{x^3} + \frac{4}{x} - 4y$
  • D
    $4y - \frac{4}{x} - \frac{1}{x^3}$

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જો $e^y(x+1)=1$ હોય, તો $\frac{d^2y}{dx^2} - \left(\frac{dy}{dx}\right)^2 = $ . . . . . . .

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