@c ----------------------------------------------------------------------
@node sincos, math
@subheading Syntax

@example
#include <math.h>

void   sincos(double *cosine, double *sine, double x);
@end example

@subheading Description

This function computes the cosine and the sine of @var{x} in a single
call, and stores the results in the addresses pointed to by @var{cosine}
and @var{sine}, respectively.  Since the function exploits a machine
instruction that computes both cosine and sine simultaneously, it is
faster to call @code{sincos} than to call @code{cos} and @code{sin} for
the same argument.

If the absolute value of @var{x} is finite but greater than or equal to
@math{2^63}, the value stored in @var{*cosine} is 1 and the value stored
in @var{*sine} is 0 (since for arguments that large each bit of the
mantissa is more than @code{Pi}).  If the value of @var{x} is infinite
or @code{NaN}, @code{NaN} is stored in both @var{*cosine} and
@var{*sine}, and @code{errno} is set to @code{EDOM}.

@subheading Return Value

None.

@subheading Portability

@portability !ansi, !posix