Matrix t2*K(2) in Subspace 31 with Dimension 8

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

-3*t*U -4*t^2 t*U 0 -(Sqrt[2]*t*U) 0 ((1 - Sqrt[2/11])*U^2)/Sqrt[2 - 2*Sqrt[2/11]] -((11 + Sqrt[22])*U^2)/(11*Sqrt[2 + 2*Sqrt[2/11]])
-4*t^2 -6*t*U U^2 0 0 0 ((11*Sqrt[4 - 4*Sqrt[2/11]] + 14*Sqrt[121 - 11*Sqrt[22]] - 22*Sqrt[22 - 2*Sqrt[22]])*t*U)/(22*Sqrt[52 - 8*Sqrt[22]]) ((209*Sqrt[2 + 2*Sqrt[2/11]] + Sqrt[11 + Sqrt[22]]*(66 + 5*Sqrt[22]))*t*U)/(66*Sqrt[26 + 4*Sqrt[22]])
t*U U^2 (-9*t*U)/2 -(U^2/Sqrt[2]) (-3*t*U)/Sqrt[2] -((t*U)/Sqrt[2]) (4*(-11 + Sqrt[22])*t^2)/(11*Sqrt[2 - 2*Sqrt[2/11]]) (4*(11 + Sqrt[22])*t^2)/(11*Sqrt[2 + 2*Sqrt[2/11]])
0 0 -(U^2/Sqrt[2]) -4*t*U 4*t^2 0 -((99*Sqrt[2 - 2*Sqrt[2/11]] + 3*Sqrt[242 - 22*Sqrt[22]] + 11*(Sqrt[44 - 4*Sqrt[22]] + 4*Sqrt[11 - Sqrt[22]]))*t*U)/(66*Sqrt[52 - 8*Sqrt[22]]) ((-517*Sqrt[4 + 4*Sqrt[2/11]] + 2*(132*Sqrt[2] - Sqrt[11])*Sqrt[11 + Sqrt[22]])*t*U)/(528*Sqrt[26 + 4*Sqrt[22]])
-(Sqrt[2]*t*U) 0 (-3*t*U)/Sqrt[2] 4*t^2 -6*t*U -(t*U) 0 0
0 0 -((t*U)/Sqrt[2]) 0 -(t*U) -5*t*U -(36*(11*Sqrt[2 - 2*Sqrt[2/11]] + Sqrt[242 - 22*Sqrt[22]])*t^2 + (6*Sqrt[242 - 22*Sqrt[22]] - 11*(Sqrt[44 - 4*Sqrt[22]] + 4*Sqrt[11 - Sqrt[22]]))*U^2)/(66*Sqrt[52 - 8*Sqrt[22]]) (-24*Sqrt[11]*t^2 - (11*Sqrt[2] + 2*Sqrt[11])*U^2)/(22*Sqrt[2 + 2*Sqrt[2/11]])
((1 - Sqrt[2/11])*U^2)/Sqrt[2 - 2*Sqrt[2/11]] ((11*Sqrt[4 - 4*Sqrt[2/11]] + 14*Sqrt[121 - 11*Sqrt[22]] - 22*Sqrt[22 - 2*Sqrt[22]])*t*U)/(22*Sqrt[52 - 8*Sqrt[22]]) ((-4 + 4*Sqrt[2/11])*t^2)/Sqrt[2 - 2*Sqrt[2/11]] -((99*Sqrt[2 - 2*Sqrt[2/11]] + 3*Sqrt[242 - 22*Sqrt[22]] + 11*(Sqrt[44 - 4*Sqrt[22]] + 4*Sqrt[11 - Sqrt[22]]))*t*U)/(66*Sqrt[52 - 8*Sqrt[22]]) 0 -(36*(11*Sqrt[2 - 2*Sqrt[2/11]] + Sqrt[242 - 22*Sqrt[22]])*t^2 + (6*Sqrt[242 - 22*Sqrt[22]] - 11*(Sqrt[44 - 4*Sqrt[22]] + 4*Sqrt[11 - Sqrt[22]]))*U^2)/(66*Sqrt[52 - 8*Sqrt[22]]) (3*(17842*Sqrt[2] - 3370*Sqrt[11] - 4015*Sqrt[52 - 8*Sqrt[22]])*t*U)/(16*Sqrt[52 - 8*Sqrt[22]]*(-11 + Sqrt[22])^2) -((69*Sqrt[11] - 121*Sqrt[(11 + Sqrt[22])/(11 - Sqrt[22])] + 11*Sqrt[(22*(11 + Sqrt[22]))/(11 - Sqrt[22])])*t*U)/528
-((11 + Sqrt[22])*U^2)/(11*Sqrt[2 + 2*Sqrt[2/11]]) ((209*Sqrt[2 + 2*Sqrt[2/11]] + Sqrt[11 + Sqrt[22]]*(66 + 5*Sqrt[22]))*t*U)/(66*Sqrt[26 + 4*Sqrt[22]]) ((4 + 4*Sqrt[2/11])*t^2)/Sqrt[2 + 2*Sqrt[2/11]] ((-517*Sqrt[4 + 4*Sqrt[2/11]] + 2*(132*Sqrt[2] - Sqrt[11])*Sqrt[11 + Sqrt[22]])*t*U)/(528*Sqrt[26 + 4*Sqrt[22]]) 0 (-24*Sqrt[11]*t^2 - (11*Sqrt[2] + 2*Sqrt[11])*U^2)/(22*Sqrt[2 + 2*Sqrt[2/11]]) -((69*Sqrt[11] - 121*Sqrt[(11 + Sqrt[22])/(11 - Sqrt[22])] + 11*Sqrt[(22*(11 + Sqrt[22]))/(11 - Sqrt[22])])*t*U)/528 (-9*(86 + 7*Sqrt[22] + 24*Sqrt[26 + 4*Sqrt[22]])*t*U)/(4*Sqrt[2 + 2*Sqrt[2/11]]*(11 + Sqrt[22])^(3/2))