\[ x y'(x) \cos (y(x))+\sin (y(x))=0 \] ✓ Mathematica : cpu = 0.0821974 (sec), leaf count = 14
\[\left \{\left \{y(x)\to \sin ^{-1}\left (\frac {e^{c_1}}{x}\right )\right \}\right \}\] ✓ Maple : cpu = 0.078 (sec), leaf count = 12
\[y \relax (x ) = \arcsin \left (\frac {1}{x c_{1}}\right )\]