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

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

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

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

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

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

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

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

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

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

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

Prove that cos80^@+cos40^@-cos20^@=0