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" Eiter wit les (Prove that) "tan20^(@)t...

" Eiter wit les (Prove that) "tan20^(@)tan40^(@)tan60^(@)tan80^(@)=3

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

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

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

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

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

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

Prove that: tan10^(@) tan20^(@)tan70^(@)tan80^(@)=1

Prove that: tan10^(@) tan20^(@)tan70^(@)tan80^(@)=1

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

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