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Cot(System.Numerics.Complex)
Method (no overloads)
Summary
cot(pi z), accurate where it vanishes: Q_n's coefficients and pi^(n + 1) magnify its
error, and at a half-whole zcos(pi z) is a rounding away from 0. The real part is reduced
by its nearest integer, the period, and near a half cot(pi r) is tan(pi (1/2 - r)), whose
argument is then exact. Complex.Tan is taken only of a small argument: of one near pi/2 it
takes the imaginary part as sinh(2y)/(cos(2x) + cosh(2y)), 0/0 on the axis.
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