\[ y''(x)-3 y'(x)-y(x)^2-2 y(x)=0 \] ✗ Mathematica : cpu = 2.92369 (sec), leaf count = 0
, could not solve
DSolve[-2*y[x] - y[x]^2 - 3*Derivative[1][y][x] + Derivative[2][y][x] == 0, y[x], x]
✗ Maple : cpu = 0. (sec), leaf count = 0
, result contains DESol or ODESolStruc
\[y \relax (x ) = \textit {\_a} \boldsymbol {\mathrm {where}}\left [\left \{\left (\frac {d}{d \textit {\_a}}\mathrm {\_}\mathrm {b}\left (\textit {\_a} \right )\right ) \textit {\_}b\left (\textit {\_a} \right )-3 \textit {\_}b\left (\textit {\_a} \right )-\textit {\_a}^{2}-2 \textit {\_a} =0\right \}, \left \{\textit {\_a} =y \relax (x ), \textit {\_}b\left (\textit {\_a} \right )=\frac {d}{d x}y \relax (x )\right \}, \left \{x =\int \frac {1}{\textit {\_}b\left (\textit {\_a} \right )}d \textit {\_a} +c_{1}, y \relax (x )=\textit {\_a} \right \}\right ]\]