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

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

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

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

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

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

Prove that: cos100^(@)+cos20^(0)=cos40^(@)

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

Prove that: cos 20^0cos 100^0+cos 100^0cos 140^0-\ cos 140^0cos 200^0=-3/4

Prove that: \ cos 20^0cos 40^0cos 80^0=1/8

Prove that: cos 10^0cos30^0cos 50^0cos 70^0=3/(16)

Prove that: cos 10^0cos30^0cos 50^0cos 70^0=3/(16)