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If A={:((cosalpha,sinalpha),(-sinalpha,c...

If `A={:((cosalpha,sinalpha),(-sinalpha,cosalpha)):}`, prove by mathematical induction
that , `A^(n)={:((cosnalpha,sinnalpha),(-sinnalpha,cosnalpha)):}` where `n(ge2)` is a positive integer.

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