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Prove that : cos 20^0cos 40^0cos 60^0cos...

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

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

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

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