cos5+cos24+cos175+cos204+cos300
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Cos24°+Cos5°+Cos175°+Cos204°+Cos300°=
cos(90-66°)+cos(180-175°)+cos175°+cos(270-66°)+cos(360-66°)=
sin66°-cos175°+cos175°-sin66°+cos60°=
cos60°=1/2
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