Prove vectorially that sum_(S=0)^(S=N-1) "cos"(2piS)/N=0 and sum_(S=0)^(S=N-1) "sin"(2piS)/N=0

Prove vectorially that sum_(S=0)^(S=N-1) "cos"(2piS)/N=0 and sum_(S=0)

1.	Prove vectorially that sum_(S=0)^(S=N-1) "cos"(2piS)/N=0 and sum_(S=0)^(S=N-1) "sin"(2piS)/N=0
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