" 15."cos20^(@)cos40^(@)cos80^(@)=(1)/(8...

" 15."cos20^(@)cos40^(@)cos80^(@)=(1)/(8)

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

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

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

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

Prove that a) (sin3A + sinA)sinA+(cos3A-cosA) cosA=0 b) cos20^(@)cos40^(@)cos80^(@)=1/8

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

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