[" 1."cos80^(@)+cos40^(@)-cos20^(@)],[" ...

[" 1."cos80^(@)+cos40^(@)-cos20^(@)],[" fortian arrak "(7)/(8)" ? "]

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

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

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

cos80 ^ (0) + cos40 ^ (@) - cos20 ^ (@) = 0

cos20^@cos40^@cos80^@=

Prove that cos80^(@)+cos40^(@)-cos20^(@)=0 .

Prove that: cos80^(@)+cos40^(@)-cos20^(@)=0

Prove that, cos80^(@)+cos40^(@)-cos20^(@)=0

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

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

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[" 1."cos80^(@)+cos40^(@)-cos20^(@)],[" fortian arrak "(7)/(8)" ? "]
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