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

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

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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^@ cos60^@ cos80^@=1/16

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

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