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tan20+tan40+tan60+..........+tan180...

`tan20+tan40+tan60+..........+tan180`

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

Prove the following : tan 20^@ tan 40^@ tan 60^@ tan 80^@=3 .

Prove that : tan 20^0 tan 40^0 tan 60^0 tan 80^0 =3

Prove that tan 20^@tan 40^@ tan 60^@ tan 80^@ = 3

Prove the following : tan 20^@ tan 40^@ tan 80^@= tan 60^@ .

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

Prove tan 20^0 tan 30^0 tan 40^0 tan 80^0=1

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