'\" t .\" Copyright 2002 Walter Harms (walter.harms@informatik.uni-oldenburg.de) .\" .\" SPDX-License-Identifier: GPL-1.0-or-later .\" .TH csin 3 2024-05-02 "Linux man-pages 6.8" .SH NAME csin, csinf, csinl \- complex sine function .SH LIBRARY Math library .RI ( libm ", " \-lm ) .SH SYNOPSIS .nf .B #include .P .BI "double complex csin(double complex " z ); .BI "float complex csinf(float complex " z ); .BI "long double complex csinl(long double complex " z ); .fi .SH DESCRIPTION These functions calculate the complex sine of .IR z . .P The complex sine function is defined as: .P .in +4n .EX csin(z) = (exp(i * z) \- exp(\-i * z)) / (2 * i) .EE .in .SH ATTRIBUTES For an explanation of the terms used in this section, see .BR attributes (7). .TS allbox; lbx lb lb l l l. Interface Attribute Value T{ .na .nh .BR csin (), .BR csinf (), .BR csinl () T} Thread safety MT-Safe .TE .SH STANDARDS C11, POSIX.1-2008. .SH HISTORY glibc 2.1. C99, POSIX.1-2001. .SH SEE ALSO .BR cabs (3), .BR casin (3), .BR ccos (3), .BR ctan (3), .BR complex (7)