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

If `A={:[(cosalpha,sinalpha),(-sinalpha,cos alpha)]` then prove that, AA' = I. Hence find `A^(-1)`

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The correct Answer is:
`A^(-1)={:[(cosalpha ,-sinalpha),(sinalpha,cosalpha)]:}`
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