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cos 6^(@) * cos 42^(@) * cos 60^(@) * co...

`cos 6^(@) * cos 42^(@) * cos 60^(@) * cos 66^@ * cos 78^@= `

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cos 20^(@)* cos 40^(@) * cos 60^(@) * cos 80^(@) =

cos6^(@) cos42^(@) cos66^(@) cos78^(@) =

(1+ cos 56^(@) + cos 58^(@) - cos 66^(@))/( cos 28^(@) cos 29^@ sin 33^(@) )=

cos 56 ^(@) + cos 58^(@) - cos 66^(@) - 4 cos 28^(@) cos 29^(@) sin 33 ^(@) =

cos 20^(@) + cos 40^(@) + cos 60^(@) +...+cos160^(@)+cos 180^(@)=

4cos6^(@)cos42^(@)cos60^(@)cos78^(@)=