यदि $y = a{e^{mx}} + b{e^{ - mx}}$ है,तो $\frac{d^2y}{dx^2} - m^2y = $

  • A
    $m^2(ae^{mx} - be^{-mx})$
  • B
    $1$
  • C
    $0$
  • D
    इनमें से कोई नहीं

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