C = 6. (3C-2D) 7. CTD + CDT 8. C²D² 9. det (CD+DC) 10. (CD – DC)-1 5 -2 1 0 -2 10 0 -4 1 -4 -11 2 1 2 0 D 2 1 -1 11 1 3 -2 -2 1 1 1 2 -1- -2 1 -3

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