The differential equation whose solution is $y = c_1 \cos ax + c_2 \sin ax$ is (where $c_1, c_2$ are arbitrary constants):

  • A
    $\frac{d^2y}{dx^2} + y^2 = 0$
  • B
    $\frac{d^2y}{dx^2} + a^2y = 0$
  • C
    $\frac{d^2y}{dx^2} + ay^2 = 0$
  • D
    $\frac{d^2y}{dx^2} - a^2y = 0$

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