What is the additive identity of
A
=
[
3
−
1
1
0
]
\displaystyle {A}={\left[\begin{array}{cc} {3}&-{1}\\{1}&{0}\end{array}\right]}
A
=
[
3
1
−
1
0
]
3
-1
1
0
0
0
0
0
-3
1
-1
0
0
1
-1
3
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