49.15.2 problem 1(b)

Internal problem ID [7688]
Book : An introduction to Ordinary Differential Equations. Earl A. Coddington. Dover. NY 1961
Section : Chapter 3. Linear equations with variable coefficients. Page 130
Problem number : 1(b)
Date solved : Monday, January 27, 2025 at 03:09:51 PM
CAS classification : [[_2nd_order, _with_linear_symmetries]]

\begin{align*} y^{\prime \prime }+3 x^{2} y^{\prime }-y x&=0 \end{align*}

Using series method with expansion around

\begin{align*} 0 \end{align*}

✓ Solution by Maple

Time used: 0.003 (sec). Leaf size: 29

Order:=6; 
dsolve(diff(y(x),x$2)+3*x^2*diff(y(x),x)-x*y(x)=0,y(x),type='series',x=0);
 

\[ y = \left (1+\frac {x^{3}}{6}\right ) y \left (0\right )+\left (x -\frac {1}{6} x^{4}\right ) y^{\prime }\left (0\right )+O\left (x^{6}\right ) \]

✓ Solution by Mathematica

Time used: 0.002 (sec). Leaf size: 28

AsymptoticDSolveValue[D[y[x],{x,2}]+3*x^2*D[y[x],x]-x*y[x]==0,y[x],{x,0,"6"-1}]
 

\[ y(x)\to c_2 \left (x-\frac {x^4}{6}\right )+c_1 \left (\frac {x^3}{6}+1\right ) \]