Ononot — If A is a 2 \times 2 diagonalizable matrix such that P^{-1}A

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Eigenvalues & Eigenvectorseasy

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If $A$ is a $2 \times 2$ diagonalizable matrix such that $P^{-1}AP = D$ , where $D = \begin{pmatrix} 1 & 0 \\ 0 & 3 \end{pmatrix}$ , which of the following diagonal matrices is also similar to $A$ ?