Solve the following IVP using the method of undetermined coefficients. y"-4y+3y=9x + 4, y(0) = 6, y'(0) = 8 y" + 5y + 4y = 16x + 20e*, y(0) = 0, y'(0) = 3 The differential equation of the a strut with both ends fixed by a clamping couple K and with two compressive equal and opposite forces P acting at the ends is dy P + dx EL K EL Using the method of undetermined coefficients, show that if y(0) = 0 = y'(0), then P y = = (1-CO 2) 1-cos P EL