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

" (ii) "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

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

Prove that a) (sin3A + sinA)sinA+(cos3A-cosA) cosA=0 b) 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