Matrix t2*K(2) in Subspace 132 with Dimension 8

(K(2) is the second-order Grosse operator)

(-5*t*U)/2 -U^2/2 -2*Sqrt[2]*t^2 -(t*U)/2 0 2*Sqrt[2]*t^2 -(t*U) (t*U)/2
-U^2/2 (-7*t*U)/2 -(Sqrt[2]*t*U) 0 0 -((t*U)/Sqrt[2]) U^2 t^2*(4 + U^2/(2*t^2))
-2*Sqrt[2]*t^2 -(Sqrt[2]*t*U) -6*t*U -2*Sqrt[2]*t^2 Sqrt[2]*t*U t*U 0 0
-(t*U)/2 0 -2*Sqrt[2]*t^2 (-11*t*U)/2 -U^2 -((4*t^2 + U^2)/Sqrt[2]) 0 (-3*t*U)/2
0 0 Sqrt[2]*t*U -U^2 -4*t*U 0 4*t^2 0
2*Sqrt[2]*t^2 -((t*U)/Sqrt[2]) t*U -((4*t^2 + U^2)/Sqrt[2]) 0 -5*t*U 0 0
-(t*U) U^2 0 0 4*t^2 0 -5*t*U -(t*U)
(t*U)/2 t^2*(4 + U^2/(2*t^2)) 0 (-3*t*U)/2 0 0 -(t*U) (-9*t*U)/2