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" (i) "tan15^(@)+tan30^(@)+tan15^(@)*tan...

" (i) "tan15^(@)+tan30^(@)+tan15^(@)*tan30^(@)=10

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

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Solve (sin 10^(@))^(tan x+tan 3x)=tan 15^(@)+tan 30^(@)+ tan 15^(@). Tan 30^(@), x in (0, pi] .

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

Prove that, tan25^(@).tan15^(@)+tan15^(@)tan50^(@)+tan25^(@)tan50^(@)=1 .

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tan15^(@)-cot15^(@)=

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