\[ \boxed { x \left ( {\frac {\rm d}{{\rm d}x}}y \left ( x \right ) \right ) \cos \left ( y \left ( x \right ) \right ) +\sin \left ( y \left ( x \right ) \right ) =0} \]
Mathematica: cpu = 0.020002 (sec), leaf count = 14 \[ \left \{\left \{y(x)\to \sin ^{-1}\left (\frac {e^{c_1}}{x}\right )\right \}\right \} \]
Maple: cpu = 0.047 (sec), leaf count = 12 \[ \left \{ y \left ( x \right ) =\arcsin \left ( {\frac {1}{{\it \_C1}\,x}} \right ) \right \} \]