Internal problem ID [13199]
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 4.1 page 399
Problem number: 41.
ODE order: 2.
ODE degree: 1.
CAS Maple gives this as type [[_2nd_order, _with_linear_symmetries]]
\[ \boxed {y^{\prime \prime }+4 y=t +{\mathrm e}^{-t}} \] With initial conditions \begin {align*} [y \left (0\right ) = 0, y^{\prime }\left (0\right ) = 0] \end {align*}
✓ Solution by Maple
Time used: 0.015 (sec). Leaf size: 26
dsolve([diff(y(t),t$2)+4*y(t)=t+exp(-t),y(0) = 0, D(y)(0) = 0],y(t), singsol=all)
\[ y \left (t \right ) = -\frac {\sin \left (2 t \right )}{40}-\frac {\cos \left (2 t \right )}{5}+\frac {t}{4}+\frac {{\mathrm e}^{-t}}{5} \]
✓ Solution by Mathematica
Time used: 0.794 (sec). Leaf size: 32
DSolve[{y''[t]+4*y[t]==t+Exp[-t],{y[0]==0,y'[0]==0}},y[t],t,IncludeSingularSolutions -> True]
\[ y(t)\to \frac {1}{40} \left (10 t+8 e^{-t}-\sin (2 t)-8 \cos (2 t)\right ) \]