題組內容
3 Let $A \in M_{n \times n}(\mathbb{R})$ be a symmetric matrix
a. (10) Show that the eigenvalues of \( A \) are real.
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3 Let $A \in M_{n \times n}(\mathbb{R})$ be a symmetric matrix
a. (10) Show that the eigenvalues of \( A \) are real.