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6tan20^(@)tan30^(@)tan40^(@)tan80^(@)=1...

6tan20^(@)tan30^(@)tan40^(@)tan80^(@)=1

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

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

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

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