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thanks for your help

i/ prove [cos(x)+isin(x)-1]/[cos(x)+isin(x)+1] = itan(x/2) Proved already ii/find roots of w^5=1 Done iii/show roots of the equation [(2+z)/(2-z)]^5 = 1 are 2itan(kpi/5) where k=0, +1, -1, +2, -2