2.287 problem 863

Internal problem ID [8443]

Book: Differential Gleichungen, E. Kamke, 3rd ed. Chelsea Pub. NY, 1948
Section: Chapter 1, Additional non-linear first order
Problem number: 863.
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 {y^{\prime }-\frac {y+x \sqrt {x^{2}+y^{2}}+x^{3} \sqrt {x^{2}+y^{2}}+x^{4} \sqrt {x^{2}+y^{2}}}{x}=0} \end {gather*}

Solution by Maple

Time used: 1.414 (sec). Leaf size: 38

dsolve(diff(y(x),x) = (y(x)+x*(y(x)^2+x^2)^(1/2)+x^3*(y(x)^2+x^2)^(1/2)+x^4*(y(x)^2+x^2)^(1/2))/x,y(x), singsol=all)
 

\[ \ln \left (\sqrt {x^{2}+y \relax (x )^{2}}+y \relax (x )\right )-\frac {x^{4}}{4}-\frac {x^{3}}{3}-x -\ln \relax (x )-c_{1} = 0 \]

Solution by Mathematica

Time used: 46.951 (sec). Leaf size: 102

DSolve[y'[x] == (y[x] + x*Sqrt[x^2 + y[x]^2] + x^3*Sqrt[x^2 + y[x]^2] + x^4*Sqrt[x^2 + y[x]^2])/x,y[x],x,IncludeSingularSolutions -> True]
 

\begin{align*} y(x)\to -\frac {x \tanh \left (\frac {x^4}{4}+\frac {x^3}{3}+x+c_1\right )}{\sqrt {\text {sech}^2\left (\frac {x^4}{4}+\frac {x^3}{3}+x+c_1\right )}} \\ y(x)\to \frac {x \tanh \left (\frac {x^4}{4}+\frac {x^3}{3}+x+c_1\right )}{\sqrt {\text {sech}^2\left (\frac {x^4}{4}+\frac {x^3}{3}+x+c_1\right )}} \\ \end{align*}