Question: 1/ Prove that if A is 3x3 triangular matrix, the eigenvalues of A are the diagonal entries of the matrix. 2/ Prove: If matrix A

1/ Prove that if A is 3x3 triangular matrix, the eigenvalues of A are the diagonal entries of the matrix.

2/ Prove: If matrix A is similar to matrix B, the A3 is similar to B3

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