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" 15.Prove that "cos20^(@)+cos100^(@)+co...

" 15.Prove that "cos20^(@)+cos100^(@)+cos140^(@)=0

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cos 20^(@) + cos 100^(@) + cos 140^(@) = 0

cos 20^(@) + cos 100^(@) + cos 140^(@) =

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

Prove that cos 20^(@) cos 40^(@) cos 80^(@)=1/8

Prove that cos 20^(@) cos 40^(@) cos 80^(@)=1/8

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

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

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

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

Prove that: cos100^(@)+cos20^(0)=cos40^(@)