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[" (iii) "tan20^(@)tan40^(@)tan60^(@)tan...

[" (iii) "tan20^(@)tan40^(@)tan60^(@)tan30^(@)=3],[" Prove that "]

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

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

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

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

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

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

Prove that: tan20^(@)tan40^(@)tan60^(@)tan80^(@)=3

Prove that :tan20^(@)tan40^(@)tan60^(@)tan80^(@)=3

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

Prove that tan20^(@)tan40^(@)tan80^(@)=tan60^(@)