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

If `A=[{:(cosalpha,sinalpha),(-sinalpha,cosalpha):}]` , then find the value of A'A

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The correct Answer is:
`=[{:(1,0),(0,1):}] " " [becausecos^(2)theta+sin^(2)theta=1]`
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