TANPI(3) FreeBSD Library Functions Manual TANPI(3)
NAME
tanpi, tanpif, tanpil - half-cycle tangent functions
LIBRARY
Math Library (libm, -lm)
SYNOPSIS
#include <math.h>
double
tanpi(double x);
float
tanpif(float x);
long double
tanpil(long double x);
DESCRIPTION
The tanpi(), tanpif(), and tanpil() functions compute the tangent of <pi>
x x and measure angles in half-cycles.
RETURN VALUES
The tanpi(), tanpif(), and tanpil() functions returns tan(<pi> x x). If
|x| >= 2^(p - 1) where p is the floating-point precision of x, then the
returned value is +-0 and it has no significance.
SPECIAL VALUES
tanpi(+-0) returns +-0.
tanpi(+-n) returns +-0 for positive integers n.
tanpi(+-n/2) returns NaN for n > 0 and raises an FE_INVALID
exception.
tanpi(+-<infinity>) return an NaN and raises an FE_INVALID
exception.
tanpi(NaN) return an NaN and raises an FE_INVALID exception.
SEE ALSO
cos(3), cospi(3), fenv(3), math(3), sin(3), sinpi(3), tan(3)
AUTHORS
The half-cycle trignometric functions were written by Steven G. Kargl
<
[email protected]>.
STANDARDS
These functions conform to IEEE Std 754tm-2008 , "IEEE Standard for
Floating-Point Arithmetic" and to ISO/IEC TS 18661-4 , "Information
technology -- Programming languages, their environments, and system
software interfaces -- Floating-point extensions for C" -- Part 4:
Supplementary functions.
FreeBSD 14.1-RELEASE-p8 April 1, 2017 FreeBSD 14.1-RELEASE-p8