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Prove that: cos20^0cos40^0cos60^0cos80^0...

Prove that: `cos20^0cos40^0cos60^0cos80^0=1/(16)`

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

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Prove that cos 20^@cos 40^@cos 60^@cos 80^@=1/16 .

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