Internal problem ID [80]
Book: Differential equations and linear algebra, 3rd ed., Edwards and Penney
Section: Section 1.6, Substitution methods and exact equations. Page 74
Problem number: 2.
ODE order: 1.
ODE degree: 1.
CAS Maple gives this as type [[_homogeneous, class A], _rational, _Bernoulli]
Solve \begin {gather*} \boxed {2 x y y^{\prime }-x^{2}-y^{2}=0} \end {gather*}
✓ Solution by Maple
Time used: 0.015 (sec). Leaf size: 27
dsolve(2*x*y(x)*diff(y(x),x) = x^2+y(x)^2,y(x), singsol=all)
\begin{align*} y \relax (x ) = \sqrt {x^{2}+x c_{1}} \\ y \relax (x ) = -\sqrt {x^{2}+x c_{1}} \\ \end{align*}
✓ Solution by Mathematica
Time used: 0.186 (sec). Leaf size: 38
DSolve[2*x*y[x]*y'[x] == x^2+y[x]^2,y[x],x,IncludeSingularSolutions -> True]
\begin{align*} y(x)\to -\sqrt {x} \sqrt {x+c_1} \\ y(x)\to \sqrt {x} \sqrt {x+c_1} \\ \end{align*}