Internal problem ID [704]
Book: Elementary differential equations and boundary value problems, 10th ed., Boyce and
DiPrima
Section: Chapter 3, Second order linear equations, section 3.6, Variation of Parameters. page
190
Problem number: 32.
ODE order: 2.
ODE degree: 1.
CAS Maple gives this as type [[_2nd_order, _with_linear_symmetries]]
\[ \boxed {\left (1-t \right ) y^{\prime \prime }+t y^{\prime }-y=2 \left (-1+t \right ) {\mathrm e}^{-t}} \]
✓ Solution by Maple
Time used: 0.016 (sec). Leaf size: 39
dsolve((1-t)*diff(y(t),t$2)+t*diff(y(t),t)-y(t) = 2*(t-1)*exp(-t),y(t), singsol=all)
\[ y \left (t \right ) = -2 \,{\mathrm e}^{-1} \operatorname {expIntegral}_{1}\left (t -1\right ) t +2 \,\operatorname {expIntegral}_{1}\left (2 t -2\right ) {\mathrm e}^{t -2}+{\mathrm e}^{t} c_{1} +c_{2} t +{\mathrm e}^{-t} \]
✓ Solution by Mathematica
Time used: 0.187 (sec). Leaf size: 47
DSolve[(1-t)*y''[t]+t*y'[t]-y[t] ==2*(t-1)*Exp[-t],y[t],t,IncludeSingularSolutions -> True]
\[ y(t)\to -2 e^{t-2} \operatorname {ExpIntegralEi}(2-2 t)+\frac {2 t \operatorname {ExpIntegralEi}(1-t)}{e}+e^{-t}+c_1 e^t-c_2 t \]