80.2.3 problem 4 (c)

Internal problem ID [18463]
Book : Elementary Differential Equations. By Thornton C. Fry. D Van Nostrand. NY. First Edition (1929)
Section : Chapter IV. Methods of solution: First order equations. section 24. Problems at page 62
Problem number : 4 (c)
Date solved : Thursday, March 13, 2025 at 12:00:55 PM
CAS classification : [_separable]

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

✓ Maple. Time used: 0.002 (sec). Leaf size: 17

ode:=y(x)-x*diff(y(x),x) = b*(1+x^2*diff(y(x),x)); 
dsolve(ode,y(x), singsol=all);
 

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

✓ Mathematica. Time used: 0.043 (sec). Leaf size: 24

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

\begin{align*} y(x)\to \frac {b+c_1 x}{b x+1} \\ y(x)\to b \\ \end{align*}

✓ Sympy. Time used: 0.342 (sec). Leaf size: 12

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

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