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Prove that cos6^@ . cos42^@. cos66^@ cos...

Prove that `cos6^@ . cos42^@. cos66^@ cos78^@= 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 .

Prove that cos 6^(@) cos 42^(@) cos 66^(@) cos 78^(@) =(1)/(16)

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

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Prove that 4 cos 6^(@) cos 42 ^(@) cos 66^(@) cos 78^(@) = (1)/(4).

Prove that 4 cos 6^(@) cos 42 ^(@) cos 66^(@) cos 78^(@) = (1)/(4).

4cos6^(@)cos42^(@)cos60^(@)cos78^(@)=