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I'm studying Erwin Kreyszig's advanced engineering Mathematics and I have an homework, how can I solve...

I'm studying Erwin Kreyszig's advanced engineering Mathematics and I have an homework, how can I solve this?

Solve the following initial value problem of 2nd ODE.

y''+0.2y'+0.26y = 1.22*e^(0.5x), y(0) = 3.5, y'(0) = 0.35

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