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If A=[(cosalpha,sinalpha),(-sinalpha,cos...

If `A=[(cosalpha,sinalpha),(-sinalpha,cosalpha)]` prove that `A.A^(T)=1` Hence find `A^(-1)`

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