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[" 27.Prove that "tan20^(@)*tan40^(@)*ta...

[" 27.Prove that "tan20^(@)*tan40^(@)*tan80^(@)=tan60^(@)" ."],[" 28.Prove that "tan20^(@)*tan40^(@)*tan60^(@)*tan80^(@)=3" ."],[" colonoment "],[[" 20."," to "40^(@)+cos80^(@)*cos160^(@)=-(1)/(-)]]

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

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

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

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

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

Prove that tan20^(@) tan40^(@) tan80^(@) = sqrt3

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

Prove that tan20^@tan30^@tan40^@tan80^@=1

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

Show that tan20^@tan40^@tan80^@=sqrt3