Internal problem ID [10177]
Book: An elementary treatise on differential equations by Abraham Cohen. DC heath publishers.
1906
Section: Chapter 2, differential equations of the first order and the first degree. Article 19. Summary.
Page 29
Problem number: Ex 26.
ODE order: 1.
ODE degree: 1.
CAS Maple gives this as type [[_1st_order, _with_linear_symmetries]]
\[ \boxed {\left (x^{2}+y^{2}\right ) \left (x +y y^{\prime }\right )+\sqrt {1+x^{2}+y^{2}}\, \left (y-y^{\prime } x \right )=0} \]
✓ Solution by Maple
Time used: 0.25 (sec). Leaf size: 27
dsolve((x^2+y(x)^2)*(x+y(x)*diff(y(x),x))+(1+x^2+y(x)^2)^(1/2)*(y(x)-x*diff(y(x),x))=0,y(x), singsol=all)
\[ \arctan \left (\frac {y \left (x \right )}{x}\right )-\sqrt {x^{2}+y \left (x \right )^{2}+1}-c_{1} = 0 \]
✓ Solution by Mathematica
Time used: 0.289 (sec). Leaf size: 27
DSolve[(x^2+y[x]^2)*(x+y[x]*y'[x])+(1+x^2+y[x]^2)^(1/2)*(y[x]-x*y'[x])==0,y[x],x,IncludeSingularSolutions -> True]
\[ \text {Solve}\left [\arctan \left (\frac {x}{y(x)}\right )+\sqrt {x^2+y(x)^2+1}=c_1,y(x)\right ] \]