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.Dd March 12, 2011 25.Dt SINCOS 3 26.Os 27.Sh NAME 28.Nm sincos , 29.Nm sincosf , 30.Nm sincosl 31.Nd sine and cosine functions 32.Sh LIBRARY 33.Lb libm 34.Sh SYNOPSIS 35.In math.h 36.Ft void 37.Fn sincos "double x" "double *s" "double *c" 38.Ft void 39.Fn sincosf "float x" "float *s" "float *c" 40.Ft void 41.Fn sincosl "long double x" "long double *s" "long double *c" 42.Sh DESCRIPTION 43The 44.Fn sincos , 45.Fn sincosf , 46and 47.Fn sincosl 48functions compute the sine and cosine of 49.Fa x . 50Using these functions allows argument reduction to occur only 51once instead of twice with individual invocations of 52.Fn sin 53and 54.Fn cos . 55Like 56.Fn sin 57and 58.Fn cos , 59a large magnitude argument may yield a result with little 60or no significance. 61.Sh RETURN VALUES 62Upon returning from 63.Fn sincos , 64.Fn sincosf , 65and 66.Fn sincosl , 67the memory pointed to by 68.Fa "*s" 69and 70.Fa "*c" 71are assigned the values of sine and cosine, respectively. 72.Sh SEE ALSO 73.Xr cos 3 , 74.Xr sin 3 75.Sh HISTORY 76These functions were added to 77.Fx 11.2 78to aid in writing various complex function contained in 79.St -isoC-99 . 80 81