72.8.1 problem 2

Internal problem ID [14686]
Book : DIFFERENTIAL EQUATIONS by Paul Blanchard, Robert L. Devaney, Glen R. Hall. 4th edition. Brooks/Cole. Boston, USA. 2012
Section : Chapter 1. First-Order Differential Equations. Review Exercises for chapter 1. page 136
Problem number : 2
Date solved : Thursday, March 13, 2025 at 04:14:28 AM
CAS classification : [_quadrature]

\begin{align*} y^{\prime }&=3 y \end{align*}

✓ Maple. Time used: 0.001 (sec). Leaf size: 10

ode:=diff(y(t),t) = 3*y(t); 
dsolve(ode,y(t), singsol=all);
 

\[ y = c_{1} {\mathrm e}^{3 t} \]

✓ Mathematica. Time used: 0.021 (sec). Leaf size: 18

ode=D[y[t],t]==3*y[t]; 
ic={}; 
DSolve[{ode,ic},y[t],t,IncludeSingularSolutions->True]
 

\begin{align*} y(t)\to c_1 e^{3 t} \\ y(t)\to 0 \\ \end{align*}

✓ Sympy. Time used: 0.126 (sec). Leaf size: 8

from sympy import * 
t = symbols("t") 
y = Function("y") 
ode = Eq(-3*y(t) + Derivative(y(t), t),0) 
ics = {} 
dsolve(ode,func=y(t),ics=ics)
 

\[ y{\left (t \right )} = C_{1} e^{3 t} \]