Using the method of multiple scales, show that the one-term uniform valid expansion of the ODE d2x

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Using the method of multiple scales, show that the one-term uniform valid expansion of the ODE d2x dt2 + x = −ǫ

dx dt

, with initial conditions x(0) =

b, ˙ x(0) = 0, is x(t, ǫ) ∼ xMS = be−ǫt 2 cos(t ), as ǫ → 0.

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