Write the form of yp that is needed for method of undeterminedcoefficients. Use the annihilator method with the lowest orderdifferential operator. DO NOT SOLVE for the coefficients. You mustshow the corresponding homogeneous solution and the differentialoperator you are applying to each side of the equation as part ofyour answer.
a. y′′ + 6y′ + 9y = 4cos x
b. y′′ + 7y′ +10y = 2e^6x + 3cos(5x)
c. y′′ + 9y′ + 20y = 5xe^4x
