What is the multiplicative identity of
A
=
[
−
19
4
−
5
1
]
\displaystyle {A}={\left[\begin{array}{cc} -{19}&{4}\\-{5}&{1}\end{array}\right]}
A
=
[
−
19
−
5
4
1
]
1
0
0
1
19
-4
5
-1
0
0
0
0
1
-4
5
-19
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