85.66.2 problem 2

Internal problem ID [22888]
Book : Applied Differential Equations. By Murray R. Spiegel. 3rd edition. 1980. Pearson. ISBN 978-0130400970
Section : Chapter 4. Linear differential equations. C Exercises at page 213
Problem number : 2
Date solved : Thursday, October 02, 2025 at 09:16:16 PM
CAS classification : [[_Emden, _Fowler], [_2nd_order, _linear, `_with_symmetry_[0,F(x)]`]]

\begin{align*} x y^{\prime \prime }-y^{\prime }-4 x^{3} y&=0 \end{align*}

✓ Maple. Time used: 0.001 (sec). Leaf size: 17

ode:=x*diff(diff(y(x),x),x)-diff(y(x),x)-4*x^3*y(x) = 0; 
dsolve(ode,y(x), singsol=all);
 

\[ y = c_1 \sinh \left (x^{2}\right )+c_2 \cosh \left (x^{2}\right ) \]

✓ Mathematica. Time used: 0.012 (sec). Leaf size: 23

ode=x*D[y[x],{x,2}]-D[y[x],x]-4*x^3*y[x]==0; 
ic={}; 
DSolve[{ode,ic},y[x],x,IncludeSingularSolutions->True]
 

\begin{align*} y(x)&\to c_1 \cosh \left (x^2\right )+i c_2 \sinh \left (x^2\right ) \end{align*}

✓ Sympy. Time used: 0.121 (sec). Leaf size: 24

from sympy import * 
x = symbols("x") 
y = Function("y") 
ode = Eq(-4*x**3*y(x) + x*Derivative(y(x), (x, 2)) - Derivative(y(x), x),0) 
ics = {} 
dsolve(ode,func=y(x),ics=ics)
 

\[ y{\left (x \right )} = x \left (C_{1} J_{\frac {1}{2}}\left (i x^{2}\right ) + C_{2} Y_{\frac {1}{2}}\left (i x^{2}\right )\right ) \]