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
     <kargl@FreeBSD.org>.

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 13.1-RELEASE-p6          April 1, 2017         FreeBSD 13.1-RELEASE-p6