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Mathematics
Problem
For a non-singular square matrix
A
A
A
, the product
A
A
−
1
AA^{-1}
A
A
−
1
equals a)
0
\mathbf{0}
0
(zero matrix) b)
A
T
A^{\mathrm T}
A
T
(transpose of
A
A
A
) c)
I
\mathbf{I}
I
(identity matrix) d)
A
A
A
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