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" (4) "10^(@)*cos20^(@)*tan40^(@)*tan50^...

" (4) "10^(@)*cos20^(@)*tan40^(@)*tan50^(@)*cosec70^(@)*sec80^(@)*sin80^(@)=1

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

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

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

sin10^(@)+sin20^(@)+sin40^(@)+sin50^(@)=sin70^(@)+sin80^(@)

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

sec70^(@)sin20^(@)+cos20^(@)cosec70^(@)=2

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

sin10^(@)+sin20^(@)+sin40^(@)+sin50^(@)-sin70^(@)-sin80^(@)=

(tan80^(@)-tan10^(@))/(tan70^(@))

(tan80^(@)-tan10^(@))/(tan70^(@))