Determine an appropriate Method of Undetermined Coefficients "guess" for the particular solution, yp, given the following second-order differential equations. You do not need to solve. (a) y′′ + 3y′ + 5y = 3e−3t (b) 2y′′ − 3y′ + 6y = cos(πt) + t2 (c) y′′ + 3y′ + 5y = 5t3e6t (d) 2y′′ − 3y′ + 6y = 3e4tsin(5t) + 5