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[" 7.Let "a.b.c" be real numbers with "a...

[" 7.Let "a.b.c" be real numbers with "a^(2)+b^(2)+c^(2)=1" ."],[" show that the equation "],[[ax-by-c,bx+ay,cx+a],[bx+a*,-ax+by-c,c'+b],[cx+a,cy+b,-ax-by+c])=0],[" represents a straight line "]

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