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the value of cos0+cos(pi/7)+cos(2pi/7)+c...

the value of `cos0+cos(pi/7)+cos(2pi/7)+cos(3pi/7)+cos(4pi/7)+cos(5pi/7)cos(6pi/7)`is (i) `1/2` (ii)`-1/2` (iii)`0` (iv)`1`

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