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[" 8.If "x+iy=(a+ib)/(a-ib)," prove that...

[" 8.If "x+iy=(a+ib)/(a-ib)," prove that "x^(2)+y^(2)=1],[" 9.Find the least positive integral value of "n" for which "((1+i)/(1-i))^(n)" is real."]

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