1 .\" Copyright 2002 Walter Harms(walter.harms@informatik.uni-oldenburg.de)
2 .\" Distributed under GPL
4 .TH CACOSH 3 2008-08-11 "" "Linux Programmer's Manual"
6 cacosh, cacoshf, cacoshl \- complex arc hyperbolic cosine
8 .B #include <complex.h>
10 .BI "double complex cacosh(double complex " z );
12 .BI "float complex cacoshf(float complex " z );
14 .BI "long double complex cacoshl(long double complex " z );
20 function calculates the complex arc hyperpolic cosine of
22 If \fIy\ =\ cacosh(z)\fP, then \fIz\ =\ ccosh(y)\fP.
25 is chosen in the interval [\-pi,pi].
28 is chosen nonnegative.
33 cacosh(z) = (0.5) * clog((1 + z) / (1 \- z))
36 These functions first appeared in glibc in version 2.1.