79.2.11 problem 6 (iv)

Internal problem ID [18445]
Book : Elementary Differential Equations. By R.L.E. Schwarzenberger. Chapman and Hall. London. First Edition (1969)
Section : Chapter 4. Autonomous systems. Exercises at page 69
Problem number : 6 (iv)
Date solved : Thursday, March 13, 2025 at 11:57:22 AM
CAS classification : [[_2nd_order, _missing_x]]

\begin{align*} x^{\prime \prime }-2 x^{\prime }+2 x&=0 \end{align*}

With initial conditions

\begin{align*} x \left (0\right )&=0\\ x^{\prime }\left (0\right )&=1 \end{align*}

✓ Maple. Time used: 0.006 (sec). Leaf size: 9

ode:=diff(diff(x(t),t),t)-2*diff(x(t),t)+2*x(t) = 0; 
ic:=x(0) = 0, D(x)(0) = 1; 
dsolve([ode,ic],x(t), singsol=all);
 

\[ x = {\mathrm e}^{t} \sin \left (t \right ) \]

✓ Mathematica. Time used: 0.013 (sec). Leaf size: 11

ode=D[x[t],{t,2}]-2*D[x[t],t]+2*x[t]==0; 
ic={x[0]==0,Derivative[1][x][0] == 1}; 
DSolve[{ode,ic},x[t],t,IncludeSingularSolutions->True]
 

\[ x(t)\to e^t \sin (t) \]

✓ Sympy. Time used: 0.162 (sec). Leaf size: 8

from sympy import * 
t = symbols("t") 
x = Function("x") 
ode = Eq(2*x(t) - 2*Derivative(x(t), t) + Derivative(x(t), (t, 2)),0) 
ics = {x(0): 0, Subs(Derivative(x(t), t), t, 0): 1} 
dsolve(ode,func=x(t),ics=ics)
 

\[ x{\left (t \right )} = e^{t} \sin {\left (t \right )} \]