\[ x y'(x) \cos (y(x))+\sin (y(x))=0 \] ✓ Mathematica : cpu = 0.0771004 (sec), leaf count = 14
\[\left \{\left \{y(x)\to \sin ^{-1}\left (\frac {e^{c_1}}{x}\right )\right \}\right \}\] ✓ Maple : cpu = 0.069 (sec), leaf count = 12
\[ \left \{ y \left ( x \right ) =\arcsin \left ( {\frac {1}{{\it \_C1}\,x}} \right ) \right \} \]