text find the eigenvalues of leftbeginarrayccc c 0 a 0 b 0 a 0 c endar
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\text { Find the eigenvalues of }\left(\begin{array}{ccc} C & 0 & A \\ 0 & B & 0 \\ A & 0 & C \end{array}\right) \lambda_{1}=11, \lambda_{2}=-29, \lambda_{3}=33