TANP 3CW "12 December 2007" "mathcw-1.00"

Table of contents


NAME

tanpf, tanp, tanpl, tanpw, tanpq, tanpll, tanpdf, tanpd, tanpdl, tanpdll - tangent function

SYNOPSIS

cc [ flags ] -I/usr/local/include file(s) -L/usr/local/lib -lmcw [ ... ]

#include <mathcw.h>

extern float tanpf (float x);

extern double tanp (double x);

extern long double tanpl (long double x);

extern __float80 tanpw (__float80 x);

extern __float128 tanpq (__float128 x);

extern long_long_double tanpll (long_long_double x);

extern decimal_float tanpdf (decimal_float x);

extern decimal_double tanpd (decimal_double x);

extern decimal_long_double tanpdl (decimal_long_double x);

extern decimal_long_long_double tanpdll (decimal_long_long_double x);

NB: Functions with prototypes containing underscores in type names may be available only with certain extended compilers.


DESCRIPTION

Compute the tangent of x, where the argument is measured in radians. Unlike the normal tangent function, the argument is reduced to the interval [-pi/2,+pi/2] as
x = PI * n + r
where PI is the best floating-point approximation to pi in working precision. The function value is then tan(r).

RETURN VALUES

If the argument is finite, its tangent is returned. Otherwise, a NaN is returned.

ERRORS

If the argument is a NaN, errno is set to EDOM, and the argument is returned. If the argument is +Infinity or -Infinity, errno is set to EDOM, and a quiet NaN is returned.

SEE ALSO

acos(3CW), acosp(3CW), acospi(3CW), asin(3CW), asinp(3CW), asinpi(3CW), atan(3CW), atan2(3CW), atan2p(3CW), atan2pi(3CW), atanp(3CW), atanpi(3CW), cos(3CW), cosp(3CW), cospi(3CW), cotan(3CW), cotanp(3CW), cotanpi(3CW), sin(3CW), sincos(3CW), sincosp(3CW), sincospi(3CW), sinp(3CW), sinpi(3CW), tan(3CW), tanpi(3CW).