.TH atan() "" "" "Mathematics Function (libm)"
.PC "Calculate inverse tangent"
.B "#include <math.h>"
\fBdouble atan(\fIarg\^\fB) double \fIarg\^\fB;\fR
.PP
.B atan()
calculates the inverse tangent of
.IR arg ,
which may be any real number.
The result will be in the range [\-\(*p/2, \(*p/2].
.SH Example
For an example of this function, see the entry for
.BR acos() .
.SH "See Also"
.Xr errno, errno
.Xr libm, libm
.Xr tan(), tan
.br
\*(AS, \(sc7.5.2.3
.br
\*(PX Standard, \(sc8.1
