Internal problem ID [8690]
Book: Differential Gleichungen, E. Kamke, 3rd ed. Chelsea Pub. NY, 1948
Section: Chapter 1, linear first order
Problem number: 354.
ODE order: 1.
ODE degree: 1.
CAS Maple gives this as type [[_1st_order, `_with_symmetry_[F(x)*G(y),0]`]]
\[ \boxed {\left (\sin \left (y\right ) x -1\right ) y^{\prime }+\cos \left (y\right )=0} \]
✓ Solution by Maple
Time used: 0.016 (sec). Leaf size: 115
dsolve((x*sin(y(x))-1)*diff(y(x),x)+cos(y(x)) = 0,y(x), singsol=all)
\begin{align*} y \left (x \right ) = \arctan \left (-\frac {\left (x c_{1} +\sqrt {c_{1}^{2}-x^{2}+1}\right ) c_{1}}{c_{1}^{2}+1}+x , \frac {x c_{1} +\sqrt {c_{1}^{2}-x^{2}+1}}{c_{1}^{2}+1}\right ) y \left (x \right ) = \arctan \left (\frac {\left (-x c_{1} +\sqrt {c_{1}^{2}-x^{2}+1}\right ) c_{1}}{c_{1}^{2}+1}+x , -\frac {-x c_{1} +\sqrt {c_{1}^{2}-x^{2}+1}}{c_{1}^{2}+1}\right ) \end{align*}
✓ Solution by Mathematica
Time used: 1.14 (sec). Leaf size: 163
DSolve[Cos[y[x]] + (-1 + x*Sin[y[x]])*y'[x]==0,y[x],x,IncludeSingularSolutions -> True]
\begin{align*} y(x)\to -\arccos \left (\frac {c_1 x-\sqrt {-x^2+1+c_1{}^2}}{1+c_1{}^2}\right ) y(x)\to \arccos \left (\frac {c_1 x-\sqrt {-x^2+1+c_1{}^2}}{1+c_1{}^2}\right ) y(x)\to -\arccos \left (\frac {\sqrt {-x^2+1+c_1{}^2}+c_1 x}{1+c_1{}^2}\right ) y(x)\to \arccos \left (\frac {\sqrt {-x^2+1+c_1{}^2}+c_1 x}{1+c_1{}^2}\right ) y(x)\to -\frac {\pi }{2} y(x)\to \frac {\pi }{2} \end{align*}