SINPI(3)               FreeBSD Library Functions Manual               SINPI(3)

NAME
     sinpi, sinpif, sinpil - half-cycle sine functions

LIBRARY
     Math Library (libm, -lm)

SYNOPSIS
     #include <math.h>

     double
     sinpi(double x);

     float
     sinpif(float x);

     long double
     sinpil(long double x);

DESCRIPTION
     The sinpi(), sinpif(), and sinpil() functions compute the sine of <pi> x
     x.  and measure angles in half-cycles.

RETURN VALUES
     The sinpi(), sinpif(), and sinpil() functions returns sin(<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
             sinpi(+-0) returns +-0.

             sinpi(+-n) returns +-0 for positive integers n.

             sinpi(+-<infinity>) return an NaN and raises an FE_INVALID
             exception.

             sinpi(NaN) return an NaN and raises an FE_INVALID exception.

SEE ALSO
     cos(3), cospi(3), fenv(3), math(3), sin(3), tan(3), tanpi(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