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1. |
If \(A = \left[ {\begin{array}{*{20}{c}} 1&{ - 1}\\ { - 1}&1 \end{array}} \right],\) then the expression A3 - 2A2 is |
A. | a null matrix |
B. | an identify matrix |
C. | equal to A |
D. | equal to -A |
Answer» B. an identify matrix | |