Determine the form of a particular solution y,(x) for the differential equations (a) y" + 6y/ + 13y = e# cos(2a) (b) y" + 3y/ + 2y = r(e - e-2") (c) y" + 4y = 3r cos(2r) -3r using the method of...

Extracted text: Determine the form of a particular solution y,(x) for the differential equations (a) y" + 6y/ + 13y = e# cos(2a) (b) y" + 3y/ + 2y = r(e - e-2") (c) y" + 4y = 3r cos(2r) -3r using the method of undetermined coefficients (Do not solve the equation).