The solution of the differential equation $\frac{d^2 y}{dt^2} + 2 \frac{dy}{dt} + y = 0$ with y(0) = y’ (0) = 1 is
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The solution of the differential equation $\frac{d^2 y}{dt^2} + 2 \frac{dy}{dt} + y = 0$ with y(0) = y’ (0) = 1 is