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" (xii) "cos80^(@)+cos40^(@)-cos20^(@)=0...

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

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

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

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

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

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

Prove that cos 80^(@) cos40^(@)+cos40^(@) cos200^(@) +cos200^(@) cos 80^(@) = -3/4

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

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

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

Prove that cos20^(@) cos40^(@) cos80^(@) = 1/8