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