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If $a$ and $b$ are constants, the most general solution of the differential equation $$\frac{d^2x}{dt^2}+2 \frac{dx}{dt}+x=0$$ is

  1. $ae^{-t}$
  2. $ae^{-t} + bte^{-t}$
  3. $ae^t+bte^{-t}$
  4. $ae^{-2t}$
in Differential Equations by (15.8k points)
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