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Question Number 127787 by bemath last updated on 02/Jan/21

 csc^2 ((π/7))+csc^2 (((2π)/7))+csc^2 (((3π)/7)) =?

$$\:\mathrm{csc}^{\mathrm{2}} \left(\frac{\pi}{\mathrm{7}}\right)+\mathrm{csc}^{\mathrm{2}} \left(\frac{\mathrm{2}\pi}{\mathrm{7}}\right)+\mathrm{csc}^{\mathrm{2}} \left(\frac{\mathrm{3}\pi}{\mathrm{7}}\right)\:=?\: \\ $$

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