40.13.3 problem 23

Internal problem ID [6757]
Book : Schaums Outline. Theory and problems of Differential Equations, 1st edition. Frank Ayres. McGraw Hill 1952
Section : Chapter 18. Linear equations with variable coefficients (Equations of second order). Supplemetary problems. Page 120
Problem number : 23
Date solved : Wednesday, March 05, 2025 at 02:42:57 AM
CAS classification : [[_2nd_order, _with_linear_symmetries]]

\begin{align*} \left (x^{2}+4\right ) y^{\prime \prime }-2 x y^{\prime }+2 y&=8 \end{align*}

✓ Maple. Time used: 0.006 (sec). Leaf size: 17

ode:=(x^2+4)*diff(diff(y(x),x),x)-2*x*diff(y(x),x)+2*y(x) = 8; 
dsolve(ode,y(x), singsol=all);
 

\[ y = c_1 \,x^{2}+c_2 x -4 c_1 +4 \]

✓ Mathematica. Time used: 0.048 (sec). Leaf size: 22

ode=(x^2+4)*D[y[x],{x,2}]-2*x*D[y[x],x]+2*y[x]==8; 
ic={}; 
DSolve[{ode,ic},y[x],x,IncludeSingularSolutions->True]
 

\[ y(x)\to c_1 (x-2 i)^2-c_2 x+4 \]

✗ Sympy

from sympy import * 
x = symbols("x") 
y = Function("y") 
ode = Eq(-2*x*Derivative(y(x), x) + (x**2 + 4)*Derivative(y(x), (x, 2)) + 2*y(x) - 8,0) 
ics = {} 
dsolve(ode,func=y(x),ics=ics)
 

NotImplementedError : The given ODE Derivative(y(x), x) - (x**2*Derivative(y(x), (x, 2))/2 + y(x) + 2*Derivative(y(x), (x, 2)) - 4)/x cannot be solved by the factorable group method