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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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