1.\" Copyright (c) 2011 Steven G. Kargl. 2.\" 3.\" Redistribution and use in source and binary forms, with or without 4.\" modification, are permitted provided that the following conditions 5.\" are met: 6.\" 1. Redistributions of source code must retain the above copyright 7.\" notice, this list of conditions and the following disclaimer. 8.\" 2. Redistributions in binary form must reproduce the above copyright 9.\" notice, this list of conditions and the following disclaimer in the 10.\" documentation and/or other materials provided with the distribution. 11.\" 12.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 13.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 14.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 15.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 16.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 17.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 18.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 19.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 20.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 21.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 22.\" SUCH DAMAGE. 23.\" 24.\" $FreeBSD$ 25.\" 26.Dd March 12, 2011 27.Dt SINCOS 3 28.Os 29.Sh NAME 30.Nm sincos , 31.Nm sincosf , 32.Nm sincosl 33.Nd sine and cosine functions 34.Sh LIBRARY 35.Lb libm 36.Sh SYNOPSIS 37.In math.h 38.Ft void 39.Fn sincos "double x" "double *s" "double *c" 40.Ft void 41.Fn sincosf "float x" "float *s" "float *c" 42.Ft void 43.Fn sincosl "long double x" "long double *s" "long double *c" 44.Sh DESCRIPTION 45The 46.Fn sincos , 47.Fn sincosf , 48and 49.Fn sincosl 50functions compute the sine and cosine of 51.Fa x . 52Using these functions allows argument reduction to occur only 53once instead of twice with individual invocations of 54.Fn sin 55and 56.Fn cos . 57Like 58.Fn sin 59and 60.Fn cos , 61a large magnitude argument may yield a result with little 62or no significance. 63.Sh RETURN VALUES 64Upon returning from 65.Fn sincos , 66.Fn sincosf , 67and 68.Fn sincosl , 69the memory pointed to by 70.Fa "*s" 71and 72.Fa "*c" 73are assigned the values of sine and cosine, respectively. 74.Sh SEE ALSO 75.Xr cos 3 , 76.Xr sin 3 77.Sh HISTORY 78These functions were added to 79.Fx 11.2 80to aid in writing various complex function contained in 81.St -isoC-99 . 82 83