\[ \cos (x) y'(x) \sin (y(x))+\sin (x) \cos (y(x))=0 \] ✓ Mathematica : cpu = 0.150897 (sec), leaf count = 29
\[\left \{\left \{y(x)\to -\cos ^{-1}\left (\frac {1}{2} c_1 \sec (x)\right )\right \},\left \{y(x)\to \cos ^{-1}\left (\frac {1}{2} c_1 \sec (x)\right )\right \}\right \}\] ✓ Maple : cpu = 0.09 (sec), leaf count = 11
\[y \relax (x ) = \arccos \left (\frac {c_{1}}{\cos \relax (x )}\right )\]