Internal problem ID [751]
Book: Elementary differential equations and boundary value problems, 10th ed., Boyce and
DiPrima
Section: Chapter 7.6, Complex Eigenvalues. page 417
Problem number: 1.
ODE order: 1.
ODE degree: 1.
Solve \begin {align*} x_{1}^{\prime }\relax (t )&=3 x_{1} \relax (t )-2 x_{2} \relax (t )\\ x_{2}^{\prime }\relax (t )&=4 x_{1} \relax (t )-x_{2} \relax (t ) \end {align*}
✓ Solution by Maple
Time used: 0.046 (sec). Leaf size: 54
dsolve([diff(x__1(t),t)=3*x__1(t)-2*x__2(t),diff(x__2(t),t)=4*x__1(t)-1*x__2(t)],[x__1(t), x__2(t)], singsol=all)
\[ x_{1} \relax (t ) = \frac {{\mathrm e}^{t} \left (c_{1} \sin \left (2 t \right )-c_{2} \sin \left (2 t \right )+\cos \left (2 t \right ) c_{1}+c_{2} \cos \left (2 t \right )\right )}{2} \] \[ x_{2} \relax (t ) = {\mathrm e}^{t} \left (c_{1} \sin \left (2 t \right )+c_{2} \cos \left (2 t \right )\right ) \]
✓ Solution by Mathematica
Time used: 0.005 (sec). Leaf size: 58
DSolve[{x1'[t]==3*x1[t]-2*x2[t],x2'[t]==4*x1[t]-1*x2[t]},{x1[t],x2[t]},t,IncludeSingularSolutions -> True]
\begin{align*} \text {x1}(t)\to e^t (c_1 \cos (2 t)+(c_1-c_2) \sin (2 t)) \\ \text {x2}(t)\to e^t (c_2 \cos (2 t)+(2 c_1-c_2) \sin (2 t)) \\ \end{align*}