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Question Number 210926 by maths_plus last updated on 22/Aug/24

$$\mathrm{valeur}\mathrm{de}:$$$${\tan }^2\left(\frac{\pi }{7}\right)+{\tan }^2\left(\frac{2\pi }{7}\right)+{\tan }^2\left(\frac{3\pi }{7}\right)=???$$

Commented by mr W last updated on 22/Aug/24

$$HalloToni:$$$$sieheQ210677$$

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