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[" 4.(a) If "A=N,B=Z" then find "(i)A uu...

[" 4.(a) If "A=N,B=Z" then find "(i)A uu B(ii)A nn B" ."],[" (b) If "x+iy=sqrt((a+ib)/(c+ia))" ,prove that ":(x^(2)+y^(2))^(2)=(a^(2)+b^(2))/(c^(2)+d^(2))]

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