If the characteristic equation of the differential equation $\frac{d^2 y}{dx^2} + 2 \alpha \frac{dy}{dx} + y = 0$ has two equal roots, then the values of a are
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If the characteristic equation of the differential equation $\frac{d^2 y}{dx^2} + 2 \alpha \frac{dy}{dx} + y = 0$ has two equal roots, then the values of a are