\[ \cos (x) y'(x) \sin (y(x))+\sin (x) \cos (y(x))=0 \] ✓ Mathematica : cpu = 0.0471148 (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 = 0.119 (sec), leaf count = 11
\[ \left \{ y \left ( x \right ) =\arccos \left ( {\frac {{\it \_C1}}{\cos \left ( x \right ) }} \right ) \right \} \]