[" 1."cos40^(@)+cos80^(@)+cos160^(@)+cos...

[" 1."cos40^(@)+cos80^(@)+cos160^(@)+cos240^(@)=],[[" (a) "0," (b) "1," (c) "1/2," (d) "-1/2]]

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cos40^(@)+cos 80^(@)+cos160^(@)+cos240^(@) =

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

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

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

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

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

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

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

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

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

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