\[ y^{(3)}(x) (x+\sin (x))+3 (\cos (x)+1) y''(x)-3 \sin (x) y'(x)-y(x) \cos (x)+\sin (x)=0 \] ✓ Mathematica : cpu = 0.0844902 (sec), leaf count = 47
\[\left \{\left \{y(x)\to \frac {c_3 x^2}{x+\sin (x)}-\frac {\cos (x)}{x+\sin (x)}+\frac {c_2 x}{x+\sin (x)}+\frac {c_1}{x+\sin (x)}\right \}\right \}\] ✓ Maple : cpu = 0.091 (sec), leaf count = 25
\[y \relax (x ) = \frac {c_{3}+c_{1} x^{2}+x c_{2}-\cos \relax (x )}{\sin \relax (x )+x}\]