Library /sys$common/syshlp/helplib.hlb  —  CRTL  catanh
    Returns the complex arc hyperbolic tangent of its argument.

    This function is supported on OpenVMS Integrity servers and
    Alpha only.

    Format

      #include  <complex.h>

      double complex catanh  (double complex z);

      float complex catanhf  (float complex z);

      long double complex catanhl  (long double complex z);
Additional Information: explode extract
Argument Description Return Values
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