CAtanh

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Returns , the principal value of the inverse hyperbolic tangent of a complex number , i.e. the principal value of  for which . The Nematrian website uses the following calculation, see Bronshtein and Semendyayev (1985):

For details of how to pass complex numbers to and from the Nematrian website and on principal values of complex-valued functions please see Complex Numbers Introduction.

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-          Computation units used

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