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cos(pi/7)+cos((2pi)/7)+cos((3pi)/7)+cos(...

`cos(pi/7)+cos((2pi)/7)+cos((3pi)/7)+cos((4pi)/7)+cos((5pi)/7)+cos((6pi)/7)=`

A

1) 0

B

2) `3/2`

C

3) `3/4`

D

4) 1

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