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

Table of contents


NAME

cotanpif, cotanpi, cotanpil, cotanpiw, cotanpiq, cotanpill, cotanpidf, cotanpid, cotanpidl, cotanpidll - cotangent function

SYNOPSIS

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

#include <mathcw.h>

extern float cotanpif (float x);

extern double cotanpi (double x);

extern long double cotanpil (long double x);

extern __float80 cotanpiw (__float80 x);

extern __float128 cotanpiq (__float128 x);

extern long_long_double cotanpill (long_long_double x);

extern decimal_float cotanpidf (decimal_float x);

extern decimal_double cotanpid (decimal_double x);

extern decimal_long_double cotanpidl (decimal_long_double x);

extern decimal_long_long_double cotanpidll (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 cotangent of x, where the argument is measured in units of pi. Thus, cotanpi(x) = cotan(pix). Unlike the normal tangent function, the argument is reduced exactly to the interval [-1,+1] by
r = modf(x, NULL).
The function value is then cotan(pir).

RETURN VALUES

If the argument is finite, its cotangent 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), sin(3CW), sincos(3CW), sincosp(3CW), sincospi(3CW), sinp(3CW), sinpi(3CW), tan(3CW), tanp(3CW), tanpi(3CW).