Matrix t*K(1) in Subspace 35 with Dimension 12

(K(1) is the first-order Grosse operator)

((I/2)*t)/Sqrt[3] (-I/12)*(-11*I + Sqrt[3])*U 0 (I/2 + 1/Sqrt[3])*t ((2*I)*t)/Sqrt[3] -((-3*I + Sqrt[3])*U)/6 0 (1 + (I/2)*Sqrt[3])*t (1/Sqrt[2] - I/Sqrt[6])*t (Sqrt[2]*U - I*Sqrt[6]*U)/6 (-I - 1/(2*Sqrt[3]))*t ((-3*I + Sqrt[3])*U)/4
((11 - I*Sqrt[3])*U)/12 ((I/2)*t)/Sqrt[3] (I/2 + 1/Sqrt[3])*t 0 0 (I + 1/Sqrt[3])*t (-3*t)/2 0 (Sqrt[2]*(1 + I*Sqrt[3])*U)/3 (-(1/Sqrt[2]) - I/Sqrt[6])*t ((3*I + Sqrt[3])*U)/12 (I/2 - 1/Sqrt[3])*t
0 (I/2 - 1/Sqrt[3])*t (-I/2)*Sqrt[3]*t (U + (3*I)*Sqrt[3]*U)/4 0 -t -(Sqrt[3]*t)/2 ((-3*I + Sqrt[3])*U)/4 0 (Sqrt[2/3] + I*Sqrt[2])*t 0 (1 + (I/2)*Sqrt[3])*t
(I/2 - 1/Sqrt[3])*t 0 ((-1 + (3*I)*Sqrt[3])*U)/4 (I/2)*Sqrt[3]*t 0 0 -((3*I + Sqrt[3])*U)/4 ((-3*I)/2)*t -((3*I + Sqrt[3])*t)/(3*Sqrt[2]) 0 t/2 0
((2*I)*t)/Sqrt[3] 0 0 0 0 0 0 0 I*Sqrt[2/3]*t 0 (2*I)*t 0
((3*I + Sqrt[3])*U)/6 (I - 1/Sqrt[3])*t t 0 0 0 Sqrt[3]*t 0 -((3*I + Sqrt[3])*U)/(3*Sqrt[2]) (I/Sqrt[2] - 1/Sqrt[6])*t (U + I*Sqrt[3]*U)/2 0
0 (3*t)/2 (Sqrt[3]*t)/2 ((-3*I + Sqrt[3])*U)/4 0 -(Sqrt[3]*t) (-I/2)*Sqrt[3]*t ((3 + I*Sqrt[3])*U)/4 0 0 0 -(Sqrt[3]*t)/2
(-1 + (I/2)*Sqrt[3])*t 0 -((3*I + Sqrt[3])*U)/4 ((-3*I)/2)*t 0 0 (I/4)*(3*I + Sqrt[3])*U (-I/2)*Sqrt[3]*t ((-1 - I*Sqrt[3])*t)/Sqrt[2] 0 (Sqrt[3]*t)/2 0
(-(1/Sqrt[2]) - I/Sqrt[6])*t (I/3)*Sqrt[2]*(I + Sqrt[3])*U 0 ((-I)/Sqrt[2] + 1/Sqrt[6])*t I*Sqrt[2/3]*t ((-3*I + Sqrt[3])*U)/(3*Sqrt[2]) 0 ((1 - I*Sqrt[3])*t)/Sqrt[2] (I*t)/Sqrt[3] (-I/6)*(-5*I + Sqrt[3])*U ((-I)/Sqrt[2] + 1/Sqrt[6])*t 0
((-I/3)*(-I + Sqrt[3])*U)/Sqrt[2] (1/Sqrt[2] - I/Sqrt[6])*t -(Sqrt[2]*(-3*I + Sqrt[3])*t)/3 0 0 (I/Sqrt[2] + 1/Sqrt[6])*t 0 0 ((5 - I*Sqrt[3])*U)/6 (I*t)/Sqrt[3] ((3*I + Sqrt[3])*U)/(3*Sqrt[2]) -((3*I + Sqrt[3])*t)/(3*Sqrt[2])
((-6*I + Sqrt[3])*t)/6 -((-3*I + Sqrt[3])*U)/12 0 -t/2 (2*I)*t (I/2)*(I + Sqrt[3])*U 0 -(Sqrt[3]*t)/2 -((3*I + Sqrt[3])*t)/(3*Sqrt[2]) -((-3*I + Sqrt[3])*U)/(3*Sqrt[2]) (-I/2)*Sqrt[3]*t (-I/4)*(-3*I + Sqrt[3])*U
-((3*I + Sqrt[3])*U)/4 (I/2 + 1/Sqrt[3])*t (-1 + (I/2)*Sqrt[3])*t 0 0 0 (Sqrt[3]*t)/2 0 0 ((-I)/Sqrt[2] + 1/Sqrt[6])*t ((3 - I*Sqrt[3])*U)/4 (I/2)*Sqrt[3]*t