cos20^(@)+cos100^(@)+cos140^(@)=...

cos20^(@)+cos100^(@)+cos140^(@)=

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

The value of cos20^(@)cos100^(@)+cos100^(@)cos140^(@)-cos140^(@)cos200^(@) is equal to

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

Prove that: cos20^(0)cos100^(@)+cos100^(@)cos140^(@)-cos140^(@)-cos140^(@)cos200^(@)=

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

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

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

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cos 20^(@) + cos 100^(@) + cos 140^(@) =

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