Engineering Mathematics (I) Homework 6-5 Class: Name: Student ID: 1. In terms of the annihilator approach, solve the given differential equation by undetermined coefficients as follows. (a) $y'' + y' - y = e^x (\sin 3x - \frac{1}{4} \cos 3x)$ (b) $y^{(4)} - 4y'' = 5x^2 - 2e^{2x}$ (c) $y''' - y'' + y' - y = xe^x - e^{-x} + 7$
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We will solve each part separately. Part (a): $y'' + y' - y = e^x (\sin 3x - \frac{1}{4} \cos 3x)$ Step 1: Find the complementary solution $y_c$. The characteristic equation for the homogeneous part $y'' + y' - y = 0$ is $r^2 + r - 1 = 0$. Using the quadratic Show more…
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