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[tan15^(@)*tan30^(@)*tan45^(@)*tan60^(@)...

[tan15^(@)*tan30^(@)*tan45^(@)*tan60^(@)*tan75^(@)=1],[tan9^(@)*tan27^(@)*tan45^(@)*tan63^(@)*tan81^(@)=1]

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tan9^(@)-tan27^(@)-tan63^(@)+tan81^(@)=

tan9^(@)-tan27^(@)-tan63^(@)+tan81^(@)=?

tan30^(@)*sec45^(@)+tan60^(@)*sec30^(@)

tan 10^(@)*tan20^(@)*tan30^(@)*tan40^(@)*tan50^(@)*tan60^@tan70^(@)*tan80^(@)=

tan9^(0)-tan27^(0)-tan63^(@)+tan81^(@)

Find tan15^(@).tan25^(@).tan45^(@).tan65^(@).tan75^(@) .

tan15^(@) + tan 75^(@)=

tan 9^(@) - tan 27^(@) - tan 63^(@) + tan 81^(@) =

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