" (b) Prove that "cos20^(@)cos40^(@)cos8...

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

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

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

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

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

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

Prove that cos20^(@)cos40^(@)cos60^(@)cos80^(@)=(1)/(16)

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