Second Order Linear Non-Homogeneous DE

Rarely Tested

Form: $$\frac{d^2y}{dx^2} + a\frac{dy}{dx} + by = R(x)$$
General solution: $$y = y_c + y_p$$
$$y_c$$: Complementary function (solution of homogeneous equation)
$$y_p$$: Particular integral (depends on $$R(x)$$).
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