Internal problem ID [4060]
Book: Ordinary Differential Equations, By Tenenbaum and Pollard. Dover, NY 1963
Section: Chapter 2. Special types of differential equations of the first kind. Lesson 12, Miscellaneous
Methods
Problem number: Exercise 12.47, page 103.
ODE order: 1.
ODE degree: 1.
CAS Maple gives this as type [[_homogeneous, class A], _rational, _dAlembert]
Solve \begin {gather*} \boxed {2 y^{3} y^{\prime }+x y^{2}-x^{3}=0} \end {gather*}
✓ Solution by Maple
Time used: 0.765 (sec). Leaf size: 711
dsolve(2*y(x)^3*diff(y(x),x)+x*y(x)^2-x^3=0,y(x), singsol=all)
\begin{align*} y \relax (x ) = -\frac {\sqrt {2 \left (2+x^{6} c_{1}^{3}+2 \sqrt {x^{6} c_{1}^{3}+1}\right )^{\frac {1}{3}}+\frac {2 c_{1}^{2} x^{4}}{\left (2+x^{6} c_{1}^{3}+2 \sqrt {x^{6} c_{1}^{3}+1}\right )^{\frac {1}{3}}}-2 c_{1} x^{2}}}{2 \sqrt {c_{1}}} \\ y \relax (x ) = \frac {\sqrt {2 \left (2+x^{6} c_{1}^{3}+2 \sqrt {x^{6} c_{1}^{3}+1}\right )^{\frac {1}{3}}+\frac {2 c_{1}^{2} x^{4}}{\left (2+x^{6} c_{1}^{3}+2 \sqrt {x^{6} c_{1}^{3}+1}\right )^{\frac {1}{3}}}-2 c_{1} x^{2}}}{2 \sqrt {c_{1}}} \\ y \relax (x ) = -\frac {\sqrt {-\left (2+x^{6} c_{1}^{3}+2 \sqrt {x^{6} c_{1}^{3}+1}\right )^{\frac {1}{3}}-\frac {c_{1}^{2} x^{4}}{\left (2+x^{6} c_{1}^{3}+2 \sqrt {x^{6} c_{1}^{3}+1}\right )^{\frac {1}{3}}}-2 c_{1} x^{2}-2 i \sqrt {3}\, \left (\frac {\left (2+x^{6} c_{1}^{3}+2 \sqrt {x^{6} c_{1}^{3}+1}\right )^{\frac {1}{3}}}{2}-\frac {c_{1}^{2} x^{4}}{2 \left (2+x^{6} c_{1}^{3}+2 \sqrt {x^{6} c_{1}^{3}+1}\right )^{\frac {1}{3}}}\right )}}{2 \sqrt {c_{1}}} \\ y \relax (x ) = \frac {\sqrt {-\left (2+x^{6} c_{1}^{3}+2 \sqrt {x^{6} c_{1}^{3}+1}\right )^{\frac {1}{3}}-\frac {c_{1}^{2} x^{4}}{\left (2+x^{6} c_{1}^{3}+2 \sqrt {x^{6} c_{1}^{3}+1}\right )^{\frac {1}{3}}}-2 c_{1} x^{2}-2 i \sqrt {3}\, \left (\frac {\left (2+x^{6} c_{1}^{3}+2 \sqrt {x^{6} c_{1}^{3}+1}\right )^{\frac {1}{3}}}{2}-\frac {c_{1}^{2} x^{4}}{2 \left (2+x^{6} c_{1}^{3}+2 \sqrt {x^{6} c_{1}^{3}+1}\right )^{\frac {1}{3}}}\right )}}{2 \sqrt {c_{1}}} \\ y \relax (x ) = -\frac {\sqrt {-\left (2+x^{6} c_{1}^{3}+2 \sqrt {x^{6} c_{1}^{3}+1}\right )^{\frac {1}{3}}-\frac {c_{1}^{2} x^{4}}{\left (2+x^{6} c_{1}^{3}+2 \sqrt {x^{6} c_{1}^{3}+1}\right )^{\frac {1}{3}}}-2 c_{1} x^{2}+2 i \sqrt {3}\, \left (\frac {\left (2+x^{6} c_{1}^{3}+2 \sqrt {x^{6} c_{1}^{3}+1}\right )^{\frac {1}{3}}}{2}-\frac {c_{1}^{2} x^{4}}{2 \left (2+x^{6} c_{1}^{3}+2 \sqrt {x^{6} c_{1}^{3}+1}\right )^{\frac {1}{3}}}\right )}}{2 \sqrt {c_{1}}} \\ y \relax (x ) = \frac {\sqrt {-\left (2+x^{6} c_{1}^{3}+2 \sqrt {x^{6} c_{1}^{3}+1}\right )^{\frac {1}{3}}-\frac {c_{1}^{2} x^{4}}{\left (2+x^{6} c_{1}^{3}+2 \sqrt {x^{6} c_{1}^{3}+1}\right )^{\frac {1}{3}}}-2 c_{1} x^{2}+2 i \sqrt {3}\, \left (\frac {\left (2+x^{6} c_{1}^{3}+2 \sqrt {x^{6} c_{1}^{3}+1}\right )^{\frac {1}{3}}}{2}-\frac {c_{1}^{2} x^{4}}{2 \left (2+x^{6} c_{1}^{3}+2 \sqrt {x^{6} c_{1}^{3}+1}\right )^{\frac {1}{3}}}\right )}}{2 \sqrt {c_{1}}} \\ \end{align*}
✓ Solution by Mathematica
Time used: 60.217 (sec). Leaf size: 714
DSolve[2*y[x]^3*y'[x]+x*y[x]^2-x^3==0,y[x],x,IncludeSingularSolutions -> True]
\begin{align*} y(x)\to -\frac {\sqrt {\sqrt [3]{x^6+2 \sqrt {e^{24 c_1}-e^{12 c_1} x^6}-2 e^{12 c_1}}-x^2+\frac {x^4}{\sqrt [3]{x^6+2 \sqrt {e^{24 c_1}-e^{12 c_1} x^6}-2 e^{12 c_1}}}}}{\sqrt {2}} \\ y(x)\to \frac {\sqrt {\sqrt [3]{x^6+2 \sqrt {e^{24 c_1}-e^{12 c_1} x^6}-2 e^{12 c_1}}-x^2+\frac {x^4}{\sqrt [3]{x^6+2 \sqrt {e^{24 c_1}-e^{12 c_1} x^6}-2 e^{12 c_1}}}}}{\sqrt {2}} \\ y(x)\to -\frac {1}{2} \sqrt {\left (-1-i \sqrt {3}\right ) \sqrt [3]{x^6+2 \sqrt {e^{24 c_1}-e^{12 c_1} x^6}-2 e^{12 c_1}}-2 x^2+\frac {i \left (\sqrt {3}+i\right ) x^4}{\sqrt [3]{x^6+2 \sqrt {e^{24 c_1}-e^{12 c_1} x^6}-2 e^{12 c_1}}}} \\ y(x)\to \frac {1}{2} \sqrt {\left (-1-i \sqrt {3}\right ) \sqrt [3]{x^6+2 \sqrt {e^{24 c_1}-e^{12 c_1} x^6}-2 e^{12 c_1}}-2 x^2+\frac {i \left (\sqrt {3}+i\right ) x^4}{\sqrt [3]{x^6+2 \sqrt {e^{24 c_1}-e^{12 c_1} x^6}-2 e^{12 c_1}}}} \\ y(x)\to -\frac {1}{2} \sqrt {i \left (\sqrt {3}+i\right ) \sqrt [3]{x^6+2 \sqrt {e^{24 c_1}-e^{12 c_1} x^6}-2 e^{12 c_1}}-2 x^2+\frac {\left (-1-i \sqrt {3}\right ) x^4}{\sqrt [3]{x^6+2 \sqrt {e^{24 c_1}-e^{12 c_1} x^6}-2 e^{12 c_1}}}} \\ y(x)\to \frac {1}{2} \sqrt {i \left (\sqrt {3}+i\right ) \sqrt [3]{x^6+2 \sqrt {e^{24 c_1}-e^{12 c_1} x^6}-2 e^{12 c_1}}-2 x^2+\frac {\left (-1-i \sqrt {3}\right ) x^4}{\sqrt [3]{x^6+2 \sqrt {e^{24 c_1}-e^{12 c_1} x^6}-2 e^{12 c_1}}}} \\ \end{align*}