64.4.8 problem 8

Internal problem ID [13218]
Book : Differential Equations by Shepley L. Ross. Third edition. John Willey. New Delhi. 2004.
Section : Chapter 2, section 2.2 (Separable equations). Exercises page 47
Problem number : 8
Date solved : Wednesday, March 05, 2025 at 09:22:50 PM
CAS classification : [_linear]

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

✓ Maple. Time used: 0.003 (sec). Leaf size: 10

ode:=x+y(x)-x*diff(y(x),x) = 0; 
dsolve(ode,y(x), singsol=all);
 

\[ y = x \left (\ln \left (x \right )+c_{1} \right ) \]

✓ Mathematica. Time used: 0.037 (sec). Leaf size: 12

ode=(x+y[x])- x*D[y[x],x]==0; 
ic={}; 
DSolve[{ode,ic},y[x],x,IncludeSingularSolutions->True]
 

\[ y(x)\to x (\log (x)+c_1) \]

✓ Sympy. Time used: 0.187 (sec). Leaf size: 8

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

\[ y{\left (x \right )} = x \left (C_{1} + \log {\left (x \right )}\right ) \]