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Question Number 171389 by cortano1 last updated on 14/Jun/22

$$\tan {}^2\left(\frac{\pi }{7}\right)+\tan {}^2\left(\frac{3\pi }{7}\right)+\tan {}^2\left(\frac{5\pi }{7}\right)=?$$

Commented by Shrinava last updated on 14/Jun/22

$$\mathrm{Or}{\sec }^2\frac{\pi }{7}+{\sec }^2\frac{3\pi }{7}+{\sec }^2\frac{5\pi }{7}=21$$

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