[" 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."],[" 10.find the real values of "theta" for which the complex pumber "1+i cos theta" is purely real."]

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