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[" 15"cos200+cos40^(@)+cos60^(@)+......+...

[" 15"cos200+cos40^(@)+cos60^(@)+......+cos160^(@)+cos180^(@)=],[[" 1) "0," 2) "1," 3) "-1]]

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cos 40^(@) + cos 80^(@) + cos 160^(@) =

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

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

cos20 ^ (@). cos40 ^ (@). cos60 ^ (@) cos80 ^ (@) =

cos20^(@).cos40^(@).cos60^(@).cos80^(@) is :

cos20^(@).cos40^(@).cos60^(@).cos80^(@)=1/16

cos20^(@).cos40^(@).cos60^(@).cos80^(@)=1/16

cos20^@cos40^@cos80^@=

Cos 40^(@) + Cos80^(@) + Cos160^(@) + Cos240^(@) =