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tan20^(@)+tan40^(@)+tan60^(@)+.........+...

tan20^(@)+tan40^(@)+tan60^(@)+.........+tan160^(@)+tan180^(@)

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tan20^(@)tan40^(@)tan80^(@)

tan 20^(@) tan 40^(@) tan 60^(@) tan 80^@=

tan 20^(@) tan 40^(@) tan 80^(@) = tan 60^(@)

tan20^(@)tan40^(@)tan60^(@)tan80^(@)

tan10^(@) tan 20^(@) tan 30^(@) tan 40^(@) tan 50^(@) tan 60^(@) tan 70^(@) tan 80^(@)=

tan20^@tan40^@tan60^@tan80^@=

Prove the following: (i) "tan" 20^(@) tan 40^(@) tan 60^(@) tan 80^(@)=3 (ii) "tan" 20^(@) tan 40^(@) tan 80^(@)="tan" 60^(@) .