.\" Copyright 2002 Walter Harms (walter.harms@informatik.uni-oldenburg.de) .\" Distributed under GPL .\" .TH CTAN 3 2008-08-11 "" "Linux Programmer's Manual" .SH NAME ctan, ctanf, ctanl \- complex tangent function .SH SYNOPSIS .B #include .sp .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 ");" .sp Link with \fI\-lm\fP. .SH DESCRIPTION The complex tangent function is defined as: .nf ctan(z) = csin(z) / ccos(z) .fi .SH VERSIONS These functions first appeared in glibc in version 2.1. .SH "CONFORMING TO" C99. .SH "SEE ALSO" .BR cabs (3), .BR ccos (3), .BR csin (3), .BR complex (7)