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[" 18.Let "A=(2)/(sqrt(3))e^(-i(pi)/(6))...

[" 18.Let "A=(2)/(sqrt(3))e^(-i(pi)/(6)),B=(2)/(sqrt(3))e^(i(pi)/(2)),C=(2)/(sqrt(3))e^(-(5 pi)/(6))" be three points forming a triangle "ABC" in the "],[" Gussain plane then triangle "ABC" is "],[[" a.equiangular "b." isosceles "],[" c.scalene "," d.None of these "]]

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