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Determine the values of r for which the given differential equation has solutions of the given form. (a) y - 3y + 2y =

Determine the values of r for which the given differential equation has solutions of the given form. (a) y" - 3y" + 2y = 0; (b) t'y" - 4ty + 4y=0; y = ert y = t for t > 0

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