COSDEG 3CW "25 January 2008" "mathcw-1.00"

Table of contents


NAME

cosdegf, cosdeg, cosdegl, cosdegw, cosdegq, cosdegll, cosdegdf, cosdegd, cosdegdl, cosdegdll - cosine function for argument in degrees

SYNOPSIS

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

#include <mathcw.h>

extern float cosdegf (float x);

extern double cosdeg (double x);

extern long double cosdegl (long double x);

extern __float80 cosdegw (__float80 x);

extern __float128 cosdegq (__float128 x);

extern long_long_double cosdegll (long_long_double x);

extern decimal_float cosdegdf (decimal_float x);

extern decimal_double cosdegd (decimal_double x);

extern decimal_long_double cosdegdl (decimal_long_double x);

extern decimal_long_long_double cosdegdll (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 cosine of x, where the argument is measured in degrees.

The argument is reduced exactly to the range [-180,+180] using the fmod() family before scaling from degrees to radians, and the cosine of that value is then computed. Special cases of arguments at multiples of 45 degrees are handled separately.


RETURN VALUES

If the argument is finite, its cosine 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), cotandeg(3CW), cotanp(3CW), cotanpi(3CW), fmod(3CW), sin(3CW), sincos(3CW), sincosp(3CW), sincospi(3CW), sindeg(3CW), sinp(3CW), sinpi(3CW), tan(3CW), tandeg(3CW), tanp(3CW), tanpi(3CW).