NAME
cosd(), cosdf(), cosdl(), cosdw(), cosdq() — degree-valued cosine functions
SYNOPSIS
#include <math.h>
double cosd(double x);
float cosdf(float x);
IA-64 ONLY:
long double cosdl(long double x);
extended cosdw(extended x);
quad cosdq(quad x);
DESCRIPTION
cosd()
returns the degree-valued cosine of
x
(x
specified in degrees).
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.
IA-64 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 IA-64 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.
STANDARDS CONFORMANCE
These functions are not specified by any standard.
Printable version
