✓ Mathematica : cpu = 0.266146 (sec), leaf count = 17
DSolve[Sin[y[x]] + Cos[x]*y[x] + (x*Cos[y[x]] + Sin[x])*Derivative[1][y][x] == 0,y[x],x]
✓ Maple : cpu = 0.075 (sec), leaf count = 15
dsolve((x*cos(y(x))+sin(x))*diff(y(x),x)+y(x)*cos(x)+sin(y(x)) = 0,y(x))