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lower limit k=1 upper limit 10 (sin2kpi/11+icos2kpi/11)
Z = sin2kpi/11 + icos2kpi/11
Z = Aei@ (ellulers form)
A = (sin2@+cos2@)1/2 = 1 ,
@ = 2kpi/11
Z = ei(2kpi/11)
sigma Z = sigma ei(2kpi/11) lim k=1 to k=10
=ei[2pi/11 (1+2+3........10)] (AP series) [ sum of Ap is n/2(2a+(n-1)d]
=ei[2pi/11(55)]
=ei10pi = cos10pi + isin10pi = 1
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