72.17.2 problem 2

Internal problem ID [14938]
Book : DIFFERENTIAL EQUATIONS by Paul Blanchard, Robert L. Devaney, Glen R. Hall. 4th edition. Brooks/Cole. Boston, USA. 2012
Section : Chapter 4. Forcing and Resonance. Section 4.2 page 412
Problem number : 2
Date solved : Tuesday, January 28, 2025 at 07:21:22 AM
CAS classification : [[_2nd_order, _linear, _nonhomogeneous]]

\begin{align*} y^{\prime \prime }+3 y^{\prime }+2 y&=5 \cos \left (t \right ) \end{align*}

✓ Solution by Maple

Time used: 0.003 (sec). Leaf size: 26

dsolve(diff(y(t),t$2)+3*diff(y(t),t)+2*y(t)=5*cos(t),y(t), singsol=all)
 

\[ y = -c_{1} {\mathrm e}^{-2 t}+\frac {\cos \left (t \right )}{2}+\frac {3 \sin \left (t \right )}{2}+c_{2} {\mathrm e}^{-t} \]

✓ Solution by Mathematica

Time used: 0.017 (sec). Leaf size: 32

DSolve[D[y[t],{t,2}]+3*D[y[t],t]+2*y[t]==5*Cos[t],y[t],t,IncludeSingularSolutions -> True]
 

\[ y(t)\to \frac {1}{2} \left (3 \sin (t)+\cos (t)+2 e^{-2 t} \left (c_2 e^t+c_1\right )\right ) \]