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[" Q.9.Prove that "],[qquad cos20^(@)cos...

[" Q.9.Prove that "],[qquad cos20^(@)cos40^(@)cos60^(@)cos80^(@)<=(1)/(16)]

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

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

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

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

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)

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