1 .\" Copyright 2002 Walter Harms (walter.harms@informatik.uni-oldenburg.de)
2 .\" Distributed under GPL
4 .TH CACOS 3 2008-08-11 "" "Linux Programmer's Manual"
6 cacos, cacosf, cacosl \- complex arc cosine
8 .B #include <complex.h>
10 .BI "double complex cacos(double complex " z );
12 .BI "float complex cacosf(float complex " z );
14 .BI "long double complex cacosl(long double complex " z );
20 function calculates the complex arc cosine of
22 If \fIy\ =\ cacos(z)\fP, then \fIz\ =\ ccos(y)\fP.
25 is chosen in the interval [0,pi].
30 cacos(z) = \-i clog(z + csqrt(z * z \- 1))
33 These functions first appeared in glibc in version 2.1.