.TH tanh() "" "" "Mathematics Function (libm)"
.PC "Calculate hyperbolic cosine"
.B "#include <math.h>"
\fBdouble tanh(\fIradian\^\fB) double \fIradian\^\fB;\fR
.PP
.B tanh()
calculates the hyperbolic tangent of
.IR radian ,
which is in radian measure.
.SH "See Also"
.Xr "libm," libm
.Xr "tan()" tan()
.br
\*(AS, \(sc7.5.3.3
.br
\*(PX Standard, \(sc8.1
.SH Diagnostics
When an overflow occurs,
.B tanh()
sets
.B errno
to
.BR ERANGE .
