12.16.38 problem 34

Internal problem ID [2100]
Book : Elementary differential equations with boundary value problems. William F. Trench. Brooks/Cole 2001
Section : Chapter 7 Series Solutions of Linear Second Equations. 7.6 THE METHOD OF FROBENIUS III. Exercises 7.7. Page 389
Problem number : 34
Date solved : Monday, January 27, 2025 at 05:42:21 AM
CAS classification : [[_2nd_order, _with_linear_symmetries]]

\begin{align*} x^{2} y^{\prime \prime }+x \left (-3 x^{2}+1\right ) y^{\prime }-4 \left (-3 x^{2}+1\right ) y&=0 \end{align*}

Using series method with expansion around

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

✓ Solution by Maple

Time used: 0.008 (sec). Leaf size: 43

Order:=6; 
dsolve(x^2*diff(y(x),x$2)+x*(1-3*x^2)*diff(y(x),x)-4*(1-3*x^2)*y(x)=0,y(x),type='series',x=0);
 

\[ y = c_1 \,x^{2} \left (1-\frac {1}{2} x^{2}+\operatorname {O}\left (x^{6}\right )\right )+\frac {c_2 \left (\ln \left (x \right ) \left (1944 x^{4}+\operatorname {O}\left (x^{6}\right )\right )+\left (-144-648 x^{2}-810 x^{4}+\operatorname {O}\left (x^{6}\right )\right )\right )}{x^{2}} \]

✓ Solution by Mathematica

Time used: 0.011 (sec). Leaf size: 50

AsymptoticDSolveValue[x^2*D[y[x],{x,2}]+x*(1-3*x^2)*D[y[x],x]-4*(1-3*x^2)*y[x]==0,y[x],{x,0,"6"-1}]
 

\[ y(x)\to c_2 \left (x^2-\frac {x^4}{2}\right )+c_1 \left (\frac {18 x^4+9 x^2+2}{2 x^2}-\frac {27}{2} x^2 \log (x)\right ) \]