" 7Prove that "cos20^(@)cos40^(@)cos60^(...

" 7Prove that "cos20^(@)cos40^(@)cos60^(@)cos80^(@)=(1)/(16)

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Prove that cos 20^(@)cos40^(@)cos60^(@)cos80^(@)=(1)/(16)

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

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

Prove that, cos20^(@)+cos60^(@)+cos100^(@)+cos140^(@)=(1)/(2)

Prove that cos 20^@ cos 40^@ cos60^@ cos80^@=1/16

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