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[" Q6."],[=3" .Prove that tan "20^(@)tan...

[" Q6."],[=3" .Prove that tan "20^(@)tan40^(@)tan60^(@)" tan "80^(@)]

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

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

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

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

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

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

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

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

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

Prove that: tan20^(@)tan30^(@)tan40^(@)tan80^(@)=1