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[" 6."tan10^(@).tan20^(@)*tan30^(@)*tan4...

[" 6."tan10^(@).tan20^(@)*tan30^(@)*tan40^(@)*tan50^(@)*tan60^(@)*tan70^(@)*tan80^(@)=],[[" A) "0," B) "1," C) "-1," D) "2]]

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

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

tan10^(@)-tan50^(@)+tan70^(@)

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

tan10^(@) tan 20^(@) tan 30^(@) tan 40^(@) tan 50^(@) tan 60^(@) tan 70^(@) tan 80^(@)=

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

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

tan10^(@)-tan50^(@)+tan70^(@)=?

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

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