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NDA2018MathematicsDifferential EquationsActual

Which one of the following differential equations has a periodic solution?

Options

  1. Ad ^2 x dt ^2 + x =0
  2. Bd ^2 x dt ^2 - x =0
  3. Cx dx dt + t =0
  4. Daligned & dx dt + xt =0 & where 0 aligned

Correct answer

A. d ^2 x dt ^2 + x =0

Step-by-step solution

The correct answer is option (A)

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