Variation of Parameters (introduction & idea)

We will discuss how to solve a non-homogeneous second-order linear differential equation with constant coefficients, i.e. ay''+by'+cy=f(t), by using the variation of parameters method. See how to solve y''+y=tan(t) with this method, please see here https://www.youtube.com/watch?v=H8DH7KwcuUQ

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