Documentation Archive Developer
Search
ADC Home > Reference Library > Reference > Mac OS X > Mac OS X Man Pages

 

This document is a Mac OS X manual page. Manual pages are a command-line technology for providing documentation. You can view these manual pages locally using the man(1) command. These manual pages come from many different sources, and thus, have a variety of writing styles.

For more information about the manual page format, see the manual page for manpages(5).



CACOSH(3)                BSD Library Functions Manual                CACOSH(3)

NAME
     cacosh -- complex inverse hyperbolic cosine function

SYNOPSIS
     double complex
     cacosh(double complex z);

     long double complex
     cacoshl(long double complex z);

     float complex
     cacoshf(float complex z);

DESCRIPTION
     cacosh(z) computes the inverse hyperbolic cosine of the complex floating-point floatingpoint
     point number z, with a branch cut on the interval [-inf, 1] along the
     real axis.

     cacosh() returns values in a half-strip of the complex plane with posi-tive positive
     tive real part and imaginary part in the interval [-Pi, Pi].

     For all complex floating point numbers z, cacosh(conj(z)) =
     conj(cacosh(z)).

SPECIAL VALUES
     The conjugate symmetry of cacosh() is used to abbreviate the specifica-tion specification
     tion of special values.

     cacosh(+-0 + 0i) returns 0 + Pi/2 i.

     cacosh(x + inf i) returns inf + Pi/2 i, for finite x.

     cacosh(x + NaN i) returns NaN + NaN i, for finite nonzero x.

     cacosh(-inf + yi) returns inf + Pi i, for finite positive-signed y.

     cacosh(inf + yi) returns inf + 0i, for finite positive-signed y.

     cacosh(-inf + inf i) returns inf + 3Pi/4 i.

     cacosh(inf + inf i) returns inf + Pi/4 i.

     cacosh(+-inf + NaN i) returns inf + NaN i.

     cacosh(NaN + yi) returns NaN + NaN i, for finite y.

     cacosh(NaN + inf i) returns inf + NaN i.

     cacosh(NaN + NaN i) returns NaN + NaN i.

NOTES
SEE ALSO
     ccosh(3) complex(3)

STANDARDS
     The cacosh() function conforms to ISO/IEC 9899:1999(E).

4th Berkeley Distribution      November 9, 2006      4th Berkeley Distribution