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[" (a) A an "A=[[2,-1],[-1,2]]" an (and)...

[" (a) A an "A=[[2,-1],[-1,2]]" an (and) "B=[[1,4],[-1,1]]],[quad =a(b)(A+B)^(2)=A^(2)+2AB+B^(2)2]

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