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cos20^0+cos80^0-sqrt(3)cos50^0 p. -1 cos...

`cos20^0+cos80^0-sqrt(3)cos50^0` p. `-1` `cos0^0+cospi/7+cos(2pi)/7+cos(3pi)/7+cos(4pi)/7+cos(5pi)/7+cos(6pi)/7` q. -3/4 `cos20^0+cos40^0+cos60^0-4cos10^0cos20^0cos30^0` r. 1 `cos20^0cos100^0+cos100^0cos140^0-cos140^0cos200^0` s. 0

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