35.Cot square pie by 7 + cot squared 2pie by 7 + cot square 4 pieby 7 equal

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c o t^{2} \frac{2 π}{7}, c o t^{2} \frac{4 π}{7}, c o t^{2} \frac{8 π}{7} (= c o t^{2} \frac{6 π}{7})

θ = c o t^{- 1} 7 + c o t^{- 1} 8 + c o t^{- 1} 18

c o t^{8} θ

2 cot ({cot}^{- 1} (3) + {cot}^{- 1} (7) + {cot}^{- 1} (13) + {cot}^{- 1} (21))

cot (\frac{π}{4} - 2 {cot}^{- 1} 3) = 7

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