15.21.2 problem 24

Internal problem ID [3326]
Book : Differential Equations by Alfred L. Nelson, Karl W. Folley, Max Coral. 3rd ed. DC heath. Boston. 1964
Section : Exercise 39, page 179
Problem number : 24
Date solved : Sunday, March 30, 2025 at 01:37:00 AM
CAS classification : [[_homogeneous, `class G`], _rational, _Clairaut]

\begin{align*} y&=y^{\prime } x +\frac {1}{y^{\prime }} \end{align*}

✓ Maple. Time used: 0.037 (sec). Leaf size: 27

ode:=y(x) = x*diff(y(x),x)+1/diff(y(x),x); 
dsolve(ode,y(x), singsol=all);
 

\begin{align*} y &= -2 \sqrt {x} \\ y &= 2 \sqrt {x} \\ y &= c_1 x +\frac {1}{c_1} \\ \end{align*}

✓ Mathematica. Time used: 0.015 (sec). Leaf size: 41

ode=y[x]==D[y[x],x]*x+1/D[y[x],x]; 
ic={}; 
DSolve[{ode,ic},y[x],x,IncludeSingularSolutions->True]
 

\begin{align*} y(x)\to c_1 x+\frac {1}{c_1} \\ y(x)\to \text {Indeterminate} \\ y(x)\to -2 \sqrt {x} \\ y(x)\to 2 \sqrt {x} \\ \end{align*}

✗ Sympy

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

Timed Out