જો $y = 100 e^{2x} + 200 e^{-2x}$ અને $\frac{d^2 y}{dx^2} = ay$ હોય,તો $a = $ . . . . . .

  • A
    $2$
  • B
    $-4$
  • C
    $0$
  • D
    $4$

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