(tan20^@tan40^@tan80^@)^2 is a prime num...

`(tan20^@tan40^@tan80^@)^2` is a prime number. True or false

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

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

Show that tan20^@tan40^@tan80^@=sqrt3

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

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

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

tan20^(@)tan30^(@)tan40^(@)tan80^(@)=1

tan20^@+tan40^@+sqrt3tan20^@tan40^@=

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

tan20^(@)-tan80^(@)+sqrt(3)=

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