Let ![A=\left[\begin{array}{ccc}1&-2&1\\-2&3&1\\1&1&5\end{array}\right]](https://tex.z-dn.net/?f=A%3D%5Cleft%5B%5Cbegin%7Barray%7D%7Bccc%7D1%26amp%3B-2%26amp%3B1%5C%5C-2%26amp%3B3%26amp%3B1%5C%5C1%26amp%3B1%26amp%3B5%5Cend%7Barray%7D%5Cright%5D "A=\left[\begin{array}{ccc}1&-2&1\\-2&3&1\\1&1&5\end{array}\right]")
. Verify that
(A⁻¹)⁻¹ = A
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