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Let A be the following matrix:
à =
det A =
A
A
1
=
ああ
X
(1) Find the adjugate matrix of A.
=
-3
-3
(2) Compute the determinant of A.
2:26
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(3) Then the inverse matrix of A is given by
1
det A
-Ã.
- 3
X 1
-1
1
-3
x + 1
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