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If `A=[[cosalpha,sinalpha],[-sinalpha,cosalpha]]` , then verify that `A^T\ A=I_2` .

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If (i) A=[[cosalpha,sinalpha],[-sinalpha,cosalpha]] , then verify that AprimeA = I .(ii) A=[[sinalpha,cosalpha],[-cosalpha,sinalpha]] , then verify that AprimeA = I .

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