If $y = x^2 e^{mx}$,where $m$ is a constant,then $\frac{d^3y}{dx^3} = $

  • A
    $m e^{mx} (m^2 x^2 + 6mx + 6)$
  • B
    $2 m^3 x e^{mx}$
  • C
    $m e^{mx} (m^2 x^2 + 2mx + 2)$
  • D
    None of these

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