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Question Number 129147 by Adel last updated on 13/Jan/21
cot^2 𝛑/7+cot^2 2𝛑/7+cot^2 3𝛑/7=?
$$\mathrm{cot}^{\mathrm{2}} \boldsymbol{\pi}/\mathrm{7}+\mathrm{cot}^{\mathrm{2}} \mathrm{2}\boldsymbol{\pi}/\mathrm{7}+\mathrm{cot}^{\mathrm{2}} \mathrm{3}\boldsymbol{\pi}/\mathrm{7}=? \\ $$
Commented by benjo_mathlover last updated on 13/Jan/21
 ans : 5
$$\:\mathrm{ans}\::\:\mathrm{5} \\ $$
Commented by Adel last updated on 13/Jan/21
pleas  solve  sir
$$\mathrm{pleas}\:\:\mathrm{solve}\:\:\mathrm{sir} \\ $$

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