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2.8 catanh, catanhf—complex arc hyperbolic tangent

Synopsis 

     #include <complex.h>
     double complex catanh(double complex z);
     float complex catanhf(float complex z);

Description
These functions compute the complex arc hyperbolic tan of z, with branch cuts outside the interval [-1, +1] along the real axis.

catanhf is identical to catanh, except that it performs its calculations on floats complex.
Returns
These functions return the complex arc hyperbolic tangent value, in the range of a strip mathematically unbounded along the real axis and in the interval [-i*p/2, +i*p/2] along the imaginary axis.
Portability
catanh and catanhf are ISO C99