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[" Let "A(a)=[[cos alpha,-sin alpha,0],[...

[" Let "A_(a)=[[cos alpha,-sin alpha,0],[sin alpha,cos alpha,0],[0,0,1]]" ,then "],[@,A_(alpha+beta)=A_(alpha)A_(beta)],[@,A_(alpha)^(-1)=2A_(-alpha)],[@,A_(alpha)^(-1)=-A_(alpha)],[@,A_(alpha)^(2)=-I]

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