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I have posted a link there to this topic so the OP can see my work.Find a particular solution y_p of the differential equation 2y′′+6y′+9y=sin^2(x)?

Find a particular solution y_p of the differential equation

2y′′+6y′+9y=sin^2(x).

using the Method of Undetermined Coefficients. Primes denote derivatives with respect to x. Thank you.