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Question Number 129147 by Adel last updated on 13/Jan/21

$${\cot }^2\mathit{\pi }/7+{\cot }^{2}2\mathit{\pi }/7+{\cot }^{2}3\mathit{\pi }/7=?$$

Commented by benjo_mathlover last updated on 13/Jan/21

$$\mathrm{ans}:5$$

Commented by Adel last updated on 13/Jan/21

$$\mathrm{pleas}\mathrm{solve}\mathrm{sir}$$

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