Matrix t2*K(2) in Subspace 115 with Dimension 4

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

-3*t*U ((-I/2)*(-I + Sqrt[3])*U^2)/Sqrt[2] (3*(1 - I*Sqrt[3])*t*U)/(2*Sqrt[2]) -4*t^2
((I/2)*(I + Sqrt[3])*U^2)/Sqrt[2] (-9*t*U)/2 ((1 + I*Sqrt[3])*(8*t^2 - U^2))/4 ((I/2)*(I + Sqrt[3])*t*U)/Sqrt[2]
(3*(1 + I*Sqrt[3])*t*U)/(2*Sqrt[2]) ((1 - I*Sqrt[3])*(8*t^2 - U^2))/4 -(t*U)/2 0
-4*t^2 ((-I/2)*(-I + Sqrt[3])*t*U)/Sqrt[2] 0 -(t*U)