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tan15^(@)+tan30^(@)+tan15^(@)*tan30^(@)=...

tan15^(@)+tan30^(@)+tan15^(@)*tan30^(@)=1

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

Prove that: 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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Evaluate : sin^(2)25^(@)+sin^(2)65^(@)+sqrt(3)tan5^(@)tan15^(@)tan30^(@)tan75^(@)tan85^(@)

Evaluate : sin^(2)25^(@)+sin^(2)65^(@)+sqrt(3)tan5^(@)tan15^(@)tan30^(@)tan75^(@)tan85^(@)

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