.\" Copyright (c) 2011 Steven G. Kargl.
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.\" $FreeBSD: head/lib/msun/man/sincos.3 366583 2020-10-09 19:12:44Z gbe $
.\" $NetBSD: sincos.3,v 1.1.2.1 2023/08/11 14:44:19 martin Exp $
.\"
.Dd June 11, 2023
.Dt SINCOS 3
.Os
.Sh NAME
.Nm sincos ,
.Nm sincosf ,
.Nm sincosl
.Nd sine and cosine functions
.Sh LIBRARY
.Lb libm
.Sh SYNOPSIS
.In math.h
.Ft void
.Fn sincos "double x" "double *s" "double *c"
.Ft void
.Fn sincosf "float x" "float *s" "float *c"
.Ft void
.Fn sincosl "long double x" "long double *s" "long double *c"
.Sh DESCRIPTION
The
.Fn sincos ,
.Fn sincosf ,
and
.Fn sincosl
functions compute the sine and cosine of
.Fa x .
Using these functions allows argument reduction to occur only
once instead of twice with individual invocations of
.Fn sin
and
.Fn cos .
Like
.Fn sin
and
.Fn cos ,
a large magnitude argument may yield a result with little
or no significance.
.Sh RETURN VALUES
Upon returning from
.Fn sincos ,
.Fn sincosf ,
and
.Fn sincosl ,
the memory pointed to by
.Ar "*s"
and
.Ar "*c"
are assigned the values of sine and cosine, respectively.
.Sh SEE ALSO
.Xr cos 3 ,
.Xr sin 3 ,
.Sh HISTORY
These functions were added to
.Fx 11.2
and
.Nx 10.0
to aid in writing various complex function contained in
.St -isoC-99 .