HP-UX Reference (11i v2 04/09) - 3 Library Functions A-M (vol 6)

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cosd(3M) cosd(3M)

NAME

cosd( ), cosdf(), cosdl( ), cosdw( ), cosdq( ) - cosine functions of an argument speciﬁed in degrees

SYNOPSIS

#include <math.h>

double cosd(double x);

float cosdf(float x);

Itanium(R)-based System Only

long double cosdl(long double x);

extended cosdw(extended x);

quad cosdq(quad x);

DESCRIPTION

cosd() returns the cosine of x (x speciﬁed in degrees).

On PA-RISC systems,

cosd() may lose accuracy when x is far from zero.

cosdf() is a float version of cosd(); it takes a

float argument and returns a float result.

Itanium-based System Only

cosdl() is a long double version of cosd(); it takes a long double argument and returns a

long double result.

cosdw() is an extended version of cosd(); it takes an extended argument and returns an

extended result.

cosdq() is equivalent to cosdl() on HP-UX systems.

USAGE

To use these functions compile either with the default

-Ae option or with the

-Aa and

-D_HPUX_SOURCE options.

To use (for Itanium-based systems)

cosdw() or cosdq(), compile also with the -fpwidetypes

option.

To use any of these functions, make sure your program includes

<math.h>, and link in the math library

by specifying -lm on the compiler or linker command line.

For more information, see the HP-UX Floating-Point Guide.

RETURN VALUE

cosd(±0) returns 1.

If x is ±INFINITY,

cosd() returns NaN and raises the invalid exception.

If x is NaN,

cosd() returns NaN.

ERRORS

No errors are deﬁned.