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A=cos 20^(@)cos 40^(@) cos60^(@)cos 80^(...

`A=cos 20^(@)cos 40^(@) cos60^(@)cos 80^(@)`,
`B=cos6^(@)cos42^(@)cos66^(@)cos78^(@)` and
`C=cos 36^(@)cos72^(@)cos 108^(@)cos 144^(@)` then

A

` A gt B gt C `

B

`B gt C gt A `

C

`C gt A gt B`

D

`A=B=C `

Text Solution

Verified by Experts

The correct Answer is:
D
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