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Prove that: cos 20^0+cos 100^0+cos 140^0...

Prove that: `cos 20^0+cos 100^0+cos 140^0=-0`

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Prove that: cos 100^0+cos 20^0=cos 40^0

Prove that: cos20^@+cos100^@+cos140^@=0 .

Prove that: cos 80^0+cos 40^0-cos 20^0=0

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Prove that: cos40^0cos80^0cos 160^0=\ -1/8

Prove that : cos 20^0cos 40^0cos 60^0cos 80^0=1/(16)

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