✓ Mathematica : cpu = 0.241408 (sec), leaf count = 17
DSolve[Sin[y[x]] - Sin[x]*y[x] + (Cos[x] + x*Cos[y[x]])*Derivative[1][y][x] == 0,y[x],x]
✓ Maple : cpu = 0.08 (sec), leaf count = 15
dsolve((x*cos(y(x))+cos(x))*diff(y(x),x)-y(x)*sin(x)+sin(y(x)) = 0,y(x))