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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 14.0-RELEASE-p11 April 1, 2017 FreeBSD 14.0-RELEASE-p11