DragonFly On-Line Manual Pages

CATANH(3)             DragonFly Library Functions Manual             CATANH(3)

NAME
     catanh, catanhf, catanhl -- complex inverse hyperbolic tangent

SYNOPSIS
     #include <complex.h>

     double complex
     catanh(double complex z);

     float complex
     catanhf(float complex z);

     long double complex
     catanhl(long double complex z);

DESCRIPTION
     The catanh(), catanhf() and catanhl() functions compute the complex
     inverse hyperbolic tangent of z.

     For all complex floating-point numbers z,

           catanh(z) = -i catan(iz).

RETURN VALUES
     The catanh(), catanhf() and catanhl() functions return the complex
     inverse hyperbolic tangent of z with imaginary part in the interval
     [-Pi/2, Pi/2], and unbounded real part.

SEE ALSO
     cacosh(3), casinh(3)

STANDARDS
     The catanh(), catanhf() and catanhl() functions conform to ISO/IEC
     9899:1999 (``ISO C99'').

DragonFly 4.1                    June 5, 2013                    DragonFly 4.1