सिद्ध कीजिए कि cos20^(@)cos40^(@)cos60...

सिद्ध कीजिए कि
`cos20^(@)cos40^(@)cos60^(@)cos80^(@)=(1)/(16)`.

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

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

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

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

cos20^(@).cos40^(@).cos60^(@).cos80^(@) is :

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

cos20^@cos40^@cos80^@=

cos40^(@)+cos 80^(@)+cos160^(@)+cos240^(@) =

cos 20^(@)* cos 40^(@) * cos 60^(@) * cos 80^(@) =

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