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cos 20^@ cos 40^@ cos 80^@=...

`cos 20^@ cos 40^@ cos 80^@=`

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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 .

Prove the following : cos 20^@ cos 40^@ cos 60^@ cos 80^@ =1/16 .

Prove that cos20^@ cos40^@ cos80^@=1/8

Prove that cos 20^@ cos 40^@ cos60^@ cos80^@=1/16

cos20^@cos40^@cos80^@=

Prove that cos20^(@) cos40^(@) cos80^(@) = 1/8

The value of cos 20^(@) cos 40^(@)cos 60^(@) cos 80^(@) is equal to

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