Question Number 210926 by maths_plus last updated on 22/Aug/24
$$\mathrm{valeur}\:\mathrm{de}\::\: \\ $$$$\mathrm{tan}^{\mathrm{2}} \left(\frac{\pi}{\mathrm{7}}\right)+\mathrm{tan}^{\mathrm{2}} \left(\frac{\mathrm{2}\pi}{\mathrm{7}}\right)+\mathrm{tan}^{\mathrm{2}} \left(\frac{\mathrm{3}\pi}{\mathrm{7}}\right)\:=\:??? \\ $$
Commented by mr W last updated on 22/Aug/24
$${Hallo}\:{Toni}: \\ $$$${siehe}\:{Q}\mathrm{210677} \\ $$