| .\" Copyright 2002 Walter Harms (walter.harms@informatik.uni-oldenburg.de) |
| .\" Distributed under GPL |
| .\" |
| .TH CASIN 3 2002-07-28 "" "complex math routines" |
| .SH NAME |
| casin, casinf, casinl \- complex arc sine |
| .SH SYNOPSIS |
| .B #include <complex.h> |
| .sp |
| .BI "double complex casin(double complex " z ); |
| .br |
| .BI "float complex casinf(float complex " z ); |
| .br |
| .BI "long double complex casinl(long double complex " z ); |
| .sp |
| Link with \-lm. |
| .SH DESCRIPTION |
| The |
| .BR casin () |
| function calculates the complex asin(). |
| If y = casin(z), then z = csin(y). |
| The real part of y is chosen in the interval [\-pi/2,pi/2]. |
| .LP |
| One has |
| casin(z) = \-i clog(iz+csqrt(1\-z*z)). |
| .SH "CONFORMING TO" |
| C99 |
| .SH "SEE ALSO" |
| .BR ccos (3), |
| .BR clog (3), |
| .BR complex (5) |