જો $y=e^{4x} \cos 5x$ હોય,તો $x=0$ આગળ $\frac{d^{2}y}{dx^{2}}$ ની કિંમત શોધો.

  • A
    $-9$
  • B
    $9$
  • C
    $8$
  • D
    $-8$

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$\frac{d^2x}{dy^2}$ ની કિંમત શોધો.

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