[" 1) "],[" (ii) "cos20^(@)cos40^(@)cos8...

[" 1) "],[" (ii) "cos20^(@)cos40^(@)cos80^(@)=(1)/(8)]

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

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

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

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

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

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: cos40^(@)cos80^(@)cos160^(@)=-(1)/(8)

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