75.12.7 problem 281

Internal problem ID [16802]
Book : A book of problems in ordinary differential equations. M.L. KRASNOV, A.L. KISELYOV, G.I. MARKARENKO. MIR, MOSCOW. 1983
Section : Section 12. Miscellaneous problems. Exercises page 93
Problem number : 281
Date solved : Monday, March 31, 2025 at 03:21:46 PM
CAS classification : [_Bernoulli]

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

✓ Maple. Time used: 0.003 (sec). Leaf size: 19

ode:=y(x)-x*y(x)^2*ln(x)+x*diff(y(x),x) = 0; 
dsolve(ode,y(x), singsol=all);
 

\[ y = -\frac {2}{\left (\ln \left (x \right )^{2}-2 c_1 \right ) x} \]

✓ Mathematica. Time used: 0.16 (sec). Leaf size: 27

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

\begin{align*} y(x)\to \frac {2}{-x \log ^2(x)+2 c_1 x} \\ y(x)\to 0 \\ \end{align*}

✓ Sympy. Time used: 0.241 (sec). Leaf size: 12

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

\[ y{\left (x \right )} = \frac {2}{x \left (C_{1} - \log {\left (x \right )}^{2}\right )} \]