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cot pi/2 là số vô tỉ hay hữu tỉ?

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Sep 27, 2018 ... ... (π/a1) + cot (π/a1)/2)i and z2 = −1/2 + (cos (π/a6)/ sin (π/a2)−cot (π/a2)/2)i, the points where the green and blue lines meet the red line x = − ... π/2, so Fn(π/2 - 0) = Fn (π/2 + 0) and hence |In|| sup Fn(0). 0 cot(π/2n) then l/\z\ < ttm(π/2n) and. 0 < argfai qn) ^ 2τι arctan-i- < 2n arctanftan-^—) = π. \z\. V. 2n / which is a contradiction. LEMMA 2. Lei α ...
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