Matrix t2*K(2) in Subspace 29 with Dimension 4

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

(-13*t*U)/2 (8*t^2 - U^2)/Sqrt[6] (4*t^2)/Sqrt[3] Sqrt[2]*t*U
(8*t^2 - U^2)/Sqrt[6] -3*t*U -((t*U)/Sqrt[2]) -((4*t^2 + U^2)/Sqrt[3])
(4*t^2)/Sqrt[3] -((t*U)/Sqrt[2]) (-15*t*U)/2 4*Sqrt[2/3]*t^2
Sqrt[2]*t*U -((4*t^2 + U^2)/Sqrt[3]) 4*Sqrt[2/3]*t^2 -4*t*U