The question is not clear . Z not equal to "such that...."?
shouldn't there be alpha instead of alpha power 9 in the second step which th...
if b=c=1 and a=(-1) then the minimum value comes out to be zero
(z-1)cosa+isina + (z-1)^-1(cosa-isina) real part is zero then lz-1l and arg(z...