\[ y(x) f'(x)+2 f(x) y'(x)+y^{(3)}(x)=0 \] ✗ Mathematica : cpu = 0.0455153 (sec), leaf count = 0
DSolve[y[x]*Derivative[1][f][x] + 2*f[x]*Derivative[1][y][x] + Derivative[3][y][x] == 0,y[x],x]
, could not solve
DSolve[y[x]*Derivative[1][f][x] + 2*f[x]*Derivative[1][y][x] + Derivative[3][y][x] == 0, y[x], x]
✗ Maple : cpu = 0. (sec), leaf count = 0
dsolve(diff(diff(diff(y(x),x),x),x)+2*f(x)*diff(y(x),x)+diff(f(x),x)*y(x)=0,y(x))
, result contains DESol or ODESolStruc
\[y \left (x \right ) = \mathit {DESol}\left (\left \{\frac {d^{2}}{d x^{2}}\textit {\_Y} \left (x \right )+\frac {f \left (x \right ) \textit {\_Y} \left (x \right )}{2}\right \}, \left \{\textit {\_Y} \left (x \right )\right \}\right )^{2}\]