Trigonometric Series

Geometry Level 4

Find The Value Of

\((\tan^2\dfrac{\pi}{7} + \tan^2\dfrac{2\pi}{7} +\tan^2\dfrac{3\pi}{7})\cdot(\cot^2\dfrac{\pi}{7} + \cot^2\dfrac{2\pi}{7} +\cot^2\dfrac{3\pi}{7})\)

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