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I : sum(k=1)^(6)[sin((2kpi)/(7))-icos((2...

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

A

only I is true

B

only II is true

C

both I and II are true

D

neither I nor II true

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