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

Table of contents


NAME

cotanpf, cotanp, cotanpl, cotanpw, cotanpq, cotanpll, cotanpdf, cotanpd, cotanpdl, cotanpdll - cotangent function

SYNOPSIS

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

#include <mathcw.h>

extern float cotanpf (float x);

extern double cotanp (double x);

extern long double cotanpl (long double x);

extern __float80 cotanpw (__float80 x);

extern __float128 cotanpq (__float128 x);

extern long_long_double cotanpll (long_long_double x);

extern decimal_float cotanpdf (decimal_float x);

extern decimal_double cotanpd (decimal_double x);

extern decimal_long_double cotanpdl (decimal_long_double x);

extern decimal_long_long_double cotanpdll (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 radians. Unlike the normal cotangent 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 cotan(r).

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), cotanpi(3CW), sin(3CW), sincos(3CW), sincosp(3CW), sincospi(3CW), sinp(3CW), sinpi(3CW), tan(3CW), tanp(3CW), tanpi(3CW).