Internal problem ID [3940]
Book: Ordinary differential equations and their solutions. By George Moseley Murphy.
1960
Section: Various 24
Problem number: 694.
ODE order: 1.
ODE degree: 1.
CAS Maple gives this as type [[_homogeneous, `class A`], _rational, _dAlembert]
\[ \boxed {x \left (2 x^{3}-y^{3}\right ) y^{\prime }-\left (x^{3}-2 y^{3}\right ) y=0} \]
✓ Solution by Maple
Time used: 0.016 (sec). Leaf size: 327
dsolve(x*(2*x^3-y(x)^3)*diff(y(x),x) = (x^3-2*y(x)^3)*y(x),y(x), singsol=all)
\begin{align*} y \left (x \right ) &= \frac {\left (\frac {\left (-108+8 x^{3} c_{1}^{3}+12 \sqrt {-12 x^{3} c_{1}^{3}+81}\right )^{\frac {1}{3}}}{2}+\frac {2 x^{2} c_{1}^{2}}{\left (-108+8 x^{3} c_{1}^{3}+12 \sqrt {-12 x^{3} c_{1}^{3}+81}\right )^{\frac {1}{3}}}+c_{1} x \right ) x}{3} \\ y \left (x \right ) &= -\frac {\left (-4 i \sqrt {3}\, c_{1}^{2} x^{2}+i \sqrt {3}\, \left (-108+8 x^{3} c_{1}^{3}+12 \sqrt {-12 x^{3} c_{1}^{3}+81}\right )^{\frac {2}{3}}+4 c_{1}^{2} x^{2}-4 c_{1} x \left (-108+8 x^{3} c_{1}^{3}+12 \sqrt {-12 x^{3} c_{1}^{3}+81}\right )^{\frac {1}{3}}+\left (-108+8 x^{3} c_{1}^{3}+12 \sqrt {-12 x^{3} c_{1}^{3}+81}\right )^{\frac {2}{3}}\right ) x}{12 \left (-108+8 x^{3} c_{1}^{3}+12 \sqrt {-12 x^{3} c_{1}^{3}+81}\right )^{\frac {1}{3}}} \\ y \left (x \right ) &= \frac {\left (-108+8 x^{3} c_{1}^{3}+12 \sqrt {-12 x^{3} c_{1}^{3}+81}\right )^{\frac {1}{3}} \left (i \sqrt {3}-1\right ) x}{12}-\frac {c_{1} x^{2} \left (i x c_{1} \sqrt {3}+c_{1} x -\left (-108+8 x^{3} c_{1}^{3}+12 \sqrt {-12 x^{3} c_{1}^{3}+81}\right )^{\frac {1}{3}}\right )}{3 \left (-108+8 x^{3} c_{1}^{3}+12 \sqrt {-12 x^{3} c_{1}^{3}+81}\right )^{\frac {1}{3}}} \\ \end{align*}
✓ Solution by Mathematica
Time used: 57.083 (sec). Leaf size: 542
DSolve[x(2 x^3-y[x]^3)y'[x]==(x^3-2 y[x]^3)y[x],y[x],x,IncludeSingularSolutions -> True]
\begin{align*} y(x)\to \frac {1}{3} \left (e^{c_1} x^2+\frac {\sqrt [3]{2 e^{3 c_1} x^6-27 x^3+3 \sqrt {81 x^6-12 e^{3 c_1} x^9}}}{\sqrt [3]{2}}+\frac {\sqrt [3]{2} e^{2 c_1} x^4}{\sqrt [3]{2 e^{3 c_1} x^6-27 x^3+3 \sqrt {81 x^6-12 e^{3 c_1} x^9}}}\right ) \\ y(x)\to \frac {e^{c_1} x^2}{3}+\frac {i \left (\sqrt {3}+i\right ) \sqrt [3]{2 e^{3 c_1} x^6-27 x^3+3 \sqrt {81 x^6-12 e^{3 c_1} x^9}}}{6 \sqrt [3]{2}}-\frac {i \left (\sqrt {3}-i\right ) e^{2 c_1} x^4}{3\ 2^{2/3} \sqrt [3]{2 e^{3 c_1} x^6-27 x^3+3 \sqrt {81 x^6-12 e^{3 c_1} x^9}}} \\ y(x)\to \frac {e^{c_1} x^2}{3}-\frac {i \left (\sqrt {3}-i\right ) \sqrt [3]{2 e^{3 c_1} x^6-27 x^3+3 \sqrt {81 x^6-12 e^{3 c_1} x^9}}}{6 \sqrt [3]{2}}+\frac {i \left (\sqrt {3}+i\right ) e^{2 c_1} x^4}{3\ 2^{2/3} \sqrt [3]{2 e^{3 c_1} x^6-27 x^3+3 \sqrt {81 x^6-12 e^{3 c_1} x^9}}} \\ y(x)\to \frac {\sqrt [3]{\sqrt {x^6}-x^3}}{\sqrt [3]{2}} \\ y(x)\to -\frac {i \left (\sqrt {3}-i\right ) \sqrt [3]{\sqrt {x^6}-x^3}}{2 \sqrt [3]{2}} \\ y(x)\to \frac {i \left (\sqrt {3}+i\right ) \sqrt [3]{\sqrt {x^6}-x^3}}{2 \sqrt [3]{2}} \\ \end{align*}