Good Bye 2015 - 1

Geometry Level 4

3tan2(π7)1tan2(π7)÷cos(π7)=? \large \dfrac{3 - \tan^2\left( \dfrac\pi7 \right)}{1 - \tan^2\left( \dfrac\pi7 \right)} \div \cos\left( \dfrac\pi7 \right) = \, ?

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