Internal problem ID [3683]
Book: Ordinary differential equations and their solutions. By George Moseley Murphy.
1960
Section: Various 32
Problem number: 957.
ODE order: 1.
ODE degree: 2.
CAS Maple gives this as type [[_1st_order, _with_linear_symmetries]]
Solve \begin {gather*} \boxed {9 y \left (y^{\prime }\right )^{2}+4 y^{\prime } x^{3}-4 y x^{2}=0} \end {gather*}
✓ Solution by Maple
Time used: 0.227 (sec). Leaf size: 91
dsolve(9*y(x)*diff(y(x),x)^2+4*x^3*diff(y(x),x)-4*x^2*y(x) = 0,y(x), singsol=all)
\begin{align*} y \relax (x ) = -\frac {i x^{2}}{3} \\ y \relax (x ) = \frac {i x^{2}}{3} \\ y \relax (x ) = 0 \\ y \relax (x ) = -\frac {2 \sqrt {c_{1} x^{2}+9}}{c_{1}} \\ y \relax (x ) = \frac {2 \sqrt {c_{1} x^{2}+9}}{c_{1}} \\ y \relax (x ) = -\frac {\sqrt {-4 c_{1} x^{2}+c_{1}^{2}}}{6} \\ y \relax (x ) = \frac {\sqrt {-4 c_{1} x^{2}+c_{1}^{2}}}{6} \\ \end{align*}
✓ Solution by Mathematica
Time used: 0.712 (sec). Leaf size: 169
DSolve[9 y[x] (y'[x])^2+4 x^3 y'[x]-4 x^2 y[x]==0,y[x],x,IncludeSingularSolutions -> True]
\begin{align*} \text {Solve}\left [\frac {1}{2} \log (y(x))-\frac {\sqrt {x^6+9 x^2 y(x)^2} \tanh ^{-1}\left (\frac {\sqrt {x^4+9 y(x)^2}}{x^2}\right )}{2 x \sqrt {x^4+9 y(x)^2}}=c_1,y(x)\right ] \\ \text {Solve}\left [\frac {\sqrt {x^6+9 x^2 y(x)^2} \tanh ^{-1}\left (\frac {\sqrt {x^4+9 y(x)^2}}{x^2}\right )}{2 x \sqrt {x^4+9 y(x)^2}}+\frac {1}{2} \log (y(x))=c_1,y(x)\right ] \\ y(x)\to -\frac {i x^2}{3} \\ y(x)\to \frac {i x^2}{3} \\ \end{align*}