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# Help please, if you could explain it that would be even better.

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Let $$\mathbf{A} = {\begin{pmatrix} \sqrt{3}/2& -1/2\\ 1/2 & \sqrt{3}/2 \end{pmatrix}}$$ Then what is $$\mathbf{A}^{2018} \begin{pmatrix} 2 \\ 2 \end{pmatrix}$$?

Aug 7, 2020