.\" Copyright 2002 Walter Harms (walter.harms@informatik.uni-oldenburg.de)
.\"
.\" %%%LICENSE_START(GPL_NOVERSION_ONELINE)
.\" Distributed under GPL
.\" %%%LICENSE_END
.\"
.TH CTAN 3 2017-09-15 "" "Linux Programmer's Manual"
.SH NAME
ctan, ctanf, ctanl \- complex tangent function
.SH SYNOPSIS
.B #include <complex.h>
.PP
.BI "double complex ctan(double complex " z ");"
.br
.BI "float complex ctanf(float complex " z );
.br
.BI "long double complex ctanl(long double complex " z ");"
.PP
Link with \fI\-lm\fP.
.SH DESCRIPTION
These functions calculate the complex tangent of
.IR z .
.PP
The complex tangent function is defined as:
.PP
.nf
    ctan(z) = csin(z) / ccos(z)
.fi
.SH VERSIONS
These functions first appeared in glibc in version 2.1.
.SH ATTRIBUTES
For an explanation of the terms used in this section, see
.BR attributes (7).
.TS
allbox;
lbw24 lb lb
l l l.
Interface	Attribute	Value
T{
.BR ctan (),
.BR ctanf (),
.BR ctanl ()
T}	Thread safety	MT-Safe
.TE
.sp 1
.SH CONFORMING TO
C99, POSIX.1-2001, POSIX.1-2008.
.SH SEE ALSO
.BR cabs (3),
.BR catan (3),
.BR ccos (3),
.BR csin (3),
.BR complex (7)