1.

I : sum_(k=1)^(6)[sin((2kpi)/(7))-icos((2kpi)/(7))]=iII : sum_(r=1)^(8)[sin((2pir)/(9))+icos((2pir)/(9))]=iWhich of the above statements are true

Answer»

A) only I
B) only II
C) Both I and II
D) neither I nor II

ANSWER :B


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