A = [-1846 494 814 538 0 0 1 0;...
494 -2092 951 314 333 0 0 0;...
814 951 -2607 130 712 0 0 0;...
538 314 130 -1064 82 0 0 0;...
0 333 712 82 -1127 0 0 0;...
0 0 0 0 0 0 0 1;...
-1 0 0 0 0 0 0 0;...
0 0 0 0 0 -1 0 0];
detA = det(A)
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