cos 40^(@)+cos 80^(@)+cos 160^(@)+cos 24...

`cos 40^(@)+cos 80^(@)+cos 160^(@)+cos 240^(@)` का मान है -

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

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

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

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

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

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

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

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

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

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