[" If "(cos theta+i sin theta)(cos2 thet...

[" If "(cos theta+i sin theta)(cos2 theta+i sin2 theta)...(cos n theta+i sin n theta)=1," then the value of "theta" is "],[[" (A) "(3m pi)/(n(n+1)),m in Z," (B) "(2m pi)/(n(n+1)),m in Z," (C) "(4m pi)/(n(n+1)),m in Z," (D) "(m pi)/(n(n+1)),m in Z]]

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