Part 3 (10 points, non-coding task)
Explain why \mathbf{A} is a symmetric matrix.
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Because
\mathbf{A}^\top
= \mathbf{A}
= \begin{bmatrix}
1 & 1 \\
1 & 0
\end{bmatrix} ,
matrix \mathbf{A} is symmetric.
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