Matrix t2*K(2) in Subspace 74 with Dimension 14

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

-(((13 + 9*Sqrt[2])*t*U)/(2 + Sqrt[2])) (-2*t*U)/(Sqrt[12 - 8*Sqrt[2]]*(2 + Sqrt[2])) 0 0 ((2 - 3*Sqrt[2])*t*U)/(2*Sqrt[2 + Sqrt[2]]) (-2*(3 + 2*Sqrt[2])*t^2)/Sqrt[2 + Sqrt[2]] 0 0 0 0 0 0 0 -2*Sqrt[3/(2 + Sqrt[2])]*t^2
(-2*t*U)/(Sqrt[12 - 8*Sqrt[2]]*(2 + Sqrt[2])) ((13*Sqrt[12 - 8*Sqrt[2]] + 2*(-2 + Sqrt[2] - 8*Sqrt[6 - 4*Sqrt[2]]))*t*U)/(Sqrt[12 - 8*Sqrt[2]]*(-2 + Sqrt[2])) 0 0 ((Sqrt[8 - 4*Sqrt[2]] + 2*Sqrt[4 - 2*Sqrt[2]] + 4*Sqrt[2 - Sqrt[2]])*t*U)/(2*Sqrt[12 - 8*Sqrt[2]]) ((6 - 4*Sqrt[2])*t^2)/Sqrt[2 - Sqrt[2]] 0 0 0 0 0 0 0 2*Sqrt[3/(2 - Sqrt[2])]*t^2
0 0 (-9*t*U)/2 (-3*t*U)/2 0 (-3*t*U)/Sqrt[2] ((-2 + 3*Sqrt[2])*t*U)/(2*Sqrt[2 + Sqrt[2]]) -((Sqrt[8 - 4*Sqrt[2]] + 2*Sqrt[4 - 2*Sqrt[2]] + 4*Sqrt[2 - Sqrt[2]])*t*U)/(2*Sqrt[12 - 8*Sqrt[2]]) t^2*(4 - U^2/(2*t^2)) -(U^2/Sqrt[2]) -(Sqrt[3]*U^2)/2 -(Sqrt[3/2]*U^2) (3*Sqrt[3]*t*U)/2 Sqrt[3/2]*t*U
0 0 (-3*t*U)/2 -7*t*U t^2*(2 + U^2/(2*t^2)) 3*Sqrt[2]*t*U 0 0 0 0 2*Sqrt[3]*t^2 0 -(Sqrt[3]*t*U) 0
((2 - 3*Sqrt[2])*t*U)/(2*Sqrt[2 + Sqrt[2]]) ((Sqrt[8 - 4*Sqrt[2]] + 2*Sqrt[4 - 2*Sqrt[2]] + 4*Sqrt[2 - Sqrt[2]])*t*U)/(2*Sqrt[12 - 8*Sqrt[2]]) 0 t^2*(2 + U^2/(2*t^2)) (-9*t*U)/2 -(U^2/Sqrt[2]) 0 0 (-3*t*U)/2 0 (-3*Sqrt[3]*t*U)/2 Sqrt[6]*t*U (Sqrt[3]*t^2*(4 - U^2/t^2))/2 Sqrt[3/2]*U^2
(-2*(3 + 2*Sqrt[2])*t^2)/Sqrt[2 + Sqrt[2]] ((6 - 4*Sqrt[2])*t^2)/Sqrt[2 - Sqrt[2]] (-3*t*U)/Sqrt[2] 3*Sqrt[2]*t*U -(U^2/Sqrt[2]) -6*t*U 0 0 0 -6*t^2 0 2*Sqrt[3]*t^2 0 0
0 0 ((-2 + 3*Sqrt[2])*t*U)/(2*Sqrt[2 + Sqrt[2]]) 0 0 0 (-5*t*U)/(2 + Sqrt[2]) (2*t^2*U)/(Sqrt[12 - 8*Sqrt[2]]*(2*t + Sqrt[2]*t)) 0 (2*(3 + Sqrt[2])*t^2)/Sqrt[2 + Sqrt[2]] 0 -2*(1 + Sqrt[2])*Sqrt[3/(2 + Sqrt[2])]*t^2 0 0
0 0 -((Sqrt[8 - 4*Sqrt[2]] + 2*Sqrt[4 - 2*Sqrt[2]] + 4*Sqrt[2 - Sqrt[2]])*t*U)/(2*Sqrt[12 - 8*Sqrt[2]]) 0 0 0 (2*t^2*U)/(Sqrt[12 - 8*Sqrt[2]]*(2*t + Sqrt[2]*t)) ((5*Sqrt[12 - 8*Sqrt[2]] - 2*(-2 + Sqrt[2] + Sqrt[6 - 4*Sqrt[2]]))*t*U)/(Sqrt[12 - 8*Sqrt[2]]*(-2 + Sqrt[2])) 0 (2*(-3 + Sqrt[2])*t^2)/Sqrt[2 - Sqrt[2]] 0 2*(Sqrt[3/(2 - Sqrt[2])] - Sqrt[6/(2 - Sqrt[2])])*t^2 0 0
0 0 t^2*(4 - U^2/(2*t^2)) 0 (-3*t*U)/2 0 0 0 (-7*t*U)/2 (3*t*U)/Sqrt[2] (-3*Sqrt[3]*t*U)/2 -(Sqrt[3/2]*t*U) 0 0
0 0 -(U^2/Sqrt[2]) 0 0 -6*t^2 (2*(3 + Sqrt[2])*t^2)/Sqrt[2 + Sqrt[2]] (2*(-3 + Sqrt[2])*t^2)/Sqrt[2 - Sqrt[2]] (3*t*U)/Sqrt[2] -6*t*U -(Sqrt[3/2]*t*U) -(Sqrt[3]*t*U) 0 -2*Sqrt[3]*t^2
0 0 -(Sqrt[3]*U^2)/2 2*Sqrt[3]*t^2 (-3*Sqrt[3]*t*U)/2 0 0 0 (-3*Sqrt[3]*t*U)/2 -(Sqrt[3/2]*t*U) (-9*t*U)/2 (5*t*U)/Sqrt[2] -2*t^2 0
0 0 -(Sqrt[3/2]*U^2) 0 Sqrt[6]*t*U 2*Sqrt[3]*t^2 -2*(1 + Sqrt[2])*Sqrt[3/(2 + Sqrt[2])]*t^2 2*(Sqrt[3/(2 - Sqrt[2])] - Sqrt[6/(2 - Sqrt[2])])*t^2 -(Sqrt[3/2]*t*U) -(Sqrt[3]*t*U) (5*t*U)/Sqrt[2] -4*t*U 0 2*t^2
0 0 (3*Sqrt[3]*t*U)/2 -(Sqrt[3]*t*U) (Sqrt[3]*t^2*(4 - U^2/t^2))/2 0 0 0 0 0 -2*t^2 0 -3*t*U Sqrt[2]*t*U
-2*Sqrt[3/(2 + Sqrt[2])]*t^2 2*Sqrt[3/(2 - Sqrt[2])]*t^2 Sqrt[3/2]*t*U 0 Sqrt[3/2]*U^2 0 0 0 0 -2*Sqrt[3]*t^2 0 2*t^2 Sqrt[2]*t*U -2*t*U