Which Formula Should I Apply?

Geometry Level 3

Find the value of E=tan2π40+tan23π40+tan25π40++tan219π40.E=\tan^2{\dfrac{\pi}{40}}+\tan^2{\dfrac{3\pi}{40}}+\tan^2{\dfrac{5\pi}{40}}+\cdots+\tan^2{\dfrac{19\pi}{40}}.

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