\[ -4 y'(x)-3 y''(x)+2 y^{(3)}(x)+y^{(4)}(x)+4 y(x)-32 \sin (2 x)+24 \cos (2 x)=0 \] ✓ Mathematica : cpu = 0.597933 (sec), leaf count = 40
\[\left \{\left \{y(x)\to \sin (2 x)+c_1 e^{-2 x}+c_2 e^{-2 x} x+c_3 e^x+c_4 e^x x\right \}\right \}\] ✓ Maple : cpu = 0.093 (sec), leaf count = 27
\[ \left \{ y \left ( x \right ) = \left ( {\it \_C4}\,x+{\it \_C2} \right ) {{\rm e}^{-2\,x}}+\sin \left ( 2\,x \right ) + \left ( {\it \_C3}\,x+{\it \_C1} \right ) {{\rm e}^{x}} \right \} \]