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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. $ae^{-2t}$

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Answer: