64.5.22 problem 22

Internal problem ID [13264]
Book : Differential Equations by Shepley L. Ross. Third edition. John Willey. New Delhi. 2004.
Section : Chapter 2, section 2.3 (Linear equations). Exercises page 56
Problem number : 22
Date solved : Monday, March 31, 2025 at 07:44:15 AM
CAS classification : [_separable]

\begin{align*} 2 x \left (y+1\right )-\left (x^{2}+1\right ) y^{\prime }&=0 \end{align*}

With initial conditions

\begin{align*} y \left (1\right )&=-5 \end{align*}

✓ Maple. Time used: 0.016 (sec). Leaf size: 11

ode:=2*x*(1+y(x))-(x^2+1)*diff(y(x),x) = 0; 
ic:=y(1) = -5; 
dsolve([ode,ic],y(x), singsol=all);
 

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

✓ Mathematica. Time used: 0.035 (sec). Leaf size: 12

ode=2*x*(y[x]+1)-(x^2+1)*D[y[x],x]==0; 
ic={y[1]==-5}; 
DSolve[{ode,ic},y[x],x,IncludeSingularSolutions->True]
 

\[ y(x)\to -2 x^2-3 \]

✓ Sympy. Time used: 0.267 (sec). Leaf size: 10

from sympy import * 
x = symbols("x") 
y = Function("y") 
ode = Eq(2*x*(y(x) + 1) - (x**2 + 1)*Derivative(y(x), x),0) 
ics = {y(1): -5} 
dsolve(ode,func=y(x),ics=ics)
 

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