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tan 20^@+tan 40^@+tan 60^@+...........+t...

`tan 20^@+tan 40^@+tan 60^@+...........+tan 160^@+tan 180^@=`

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

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

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

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

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

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

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

tan70^@-tan20^@-2tan40^@=

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