cot-2-pi-7-cot-2-2pi-7-cot-2-7pi-2-answer-by-solve-

Question Number 129242 by Adel last updated on 14/Jan/21

\cot^{2} \frac{π}{7} + \cot^{2} \frac{2 π}{7} + \cot^{2} \frac{7 π}{2} = ?

answer by solve

Commented by liberty last updated on 14/Jan/21

qn 128582

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