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tan20^(@)tan40^(@)tan60^(@)tan80^(@)=3...

tan20^(@)tan40^(@)tan60^(@)tan80^(@)=3

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

Prove that: (a) tan 20^(@)tan40^(@)tan60^(@)tan 80^(@)=3 (b) tan9^(@)-tan27^(@)-tan63^(@)+tan81^(@)=4

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

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

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

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

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

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