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Show that cos20^o cos40^o cos60^o cos80^...

Show that `cos20^o cos40^o cos60^o cos80^o =1/16`

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

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

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

Show that sin20^o sin40^o sin60^o sin80^o =3/16

Prove that, cos20^@cos40^@cos60^@cos80^@=1/16

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

cos20^@cos40^@cos80^@=

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

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