" 13) Prove that "cos40^(@)cos100^(@)cos...

" 13) Prove that "cos40^(@)cos100^(@)cos160^(@)=(1)/(2)

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

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

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

Prove that: cos20^(@)+cos100^(@)+cos140^(@)=-0

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

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

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

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

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

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

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