[" Q.44",tan20^(@)tan40^(@)tan60^(@)tan80^(@)=],[,[" (1) "1," (2) "2," (3) "3," (4) "sqrt(3)/2]]

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

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

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

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

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

tan20^(@)-tan80^(@)+sqrt(3)tan20^(@)tan80^(@)=

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