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