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[" 7.If "(x+iy)=a+ib," where "x,y,a,b in...

[" 7.If "(x+iy)=a+ib," where "x,y,a,b in R," show that "(--(2)/(a))/(=)-2(a^(2)+b^(-))],[" 8.If "((1+i)^(2))/(2-1)=x+iy," then find the value of "x+y" ."],[" 9.If "n" is any integer,then find the value of "(1-i)^(n)(1-(1)/(1))^(n)]

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