Matrix t2*K(2) in Subspace 103 with Dimension 3

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

(-9*t*U)/2 ((3 + I*Sqrt[3])*U^2)/4 (3*(I + Sqrt[3])*t*U)/(2*Sqrt[2])
((3 - I*Sqrt[3])*U^2)/4 (-15*t*U)/2 0
(3*(-I + Sqrt[3])*t*U)/(2*Sqrt[2]) 0 -6*t*U