73.10.2 problem 15.2 (b)

Internal problem ID [15218]
Book : Ordinary Differential Equations. An introduction to the fundamentals. Kenneth B. Howell. second edition. CRC Press. FL, USA. 2020
Section : Chapter 15. General solutions to Homogeneous linear differential equations. Additional exercises page 294
Problem number : 15.2 (b)
Date solved : Thursday, March 13, 2025 at 05:49:41 AM
CAS classification : [[_2nd_order, _missing_x]]

\begin{align*} y^{\prime \prime }-4 y&=0 \end{align*}

With initial conditions

\begin{align*} y \left (0\right )&=0\\ y^{\prime }\left (0\right )&=12 \end{align*}

✓ Maple. Time used: 0.016 (sec). Leaf size: 17

ode:=diff(diff(y(x),x),x)-4*y(x) = 0; 
ic:=y(0) = 0, D(y)(0) = 12; 
dsolve([ode,ic],y(x), singsol=all);
 

\[ y = 3 \,{\mathrm e}^{2 x}-3 \,{\mathrm e}^{-2 x} \]

✓ Mathematica. Time used: 0.013 (sec). Leaf size: 19

ode=D[y[x],{x,2}]-4*y[x]==0; 
ic={y[0]==0,Derivative[1][y][0] ==12}; 
DSolve[{ode,ic},y[x],x,IncludeSingularSolutions->True]
 

\[ y(x)\to 3 e^{-2 x} \left (e^{4 x}-1\right ) \]

✓ Sympy. Time used: 0.085 (sec). Leaf size: 15

from sympy import * 
x = symbols("x") 
y = Function("y") 
ode = Eq(-4*y(x) + Derivative(y(x), (x, 2)),0) 
ics = {y(0): 0, Subs(Derivative(y(x), x), x, 0): 12} 
dsolve(ode,func=y(x),ics=ics)
 

\[ y{\left (x \right )} = 3 e^{2 x} - 3 e^{- 2 x} \]