1.114 problem 114

Internal problem ID [7695]

Book: Differential Gleichungen, E. Kamke, 3rd ed. Chelsea Pub. NY, 1948
Section: Chapter 1, linear first order
Problem number: 114.
ODE order: 1.
ODE degree: 1.

CAS Maple gives this as type [[_1st_order, _with_symmetry_[F(x),G(x)*y+H(x)]]]

Solve \begin {gather*} \boxed {x y^{\prime }-x \sqrt {y^{2}+x^{2}}-y=0} \end {gather*}

Solution by Maple

Time used: 15.844 (sec). Leaf size: 28

dsolve(x*diff(y(x),x) - x*sqrt(y(x)^2 + x^2) - y(x)=0,y(x), singsol=all)
 

\[ \ln \left (\sqrt {x^{2}+y \relax (x )^{2}}+y \relax (x )\right )-x -\ln \relax (x )-c_{1} = 0 \]

Solution by Mathematica

Time used: 0.441 (sec). Leaf size: 12

DSolve[x*y'[x] - x*Sqrt[y[x]^2 + x^2] - y[x]==0,y[x],x,IncludeSingularSolutions -> True]
 

\begin{align*} y(x)\to x \sinh (x+c_1) \\ \end{align*}