'\" t .\" Copyright 2002 Walter Harms (walter.harms@informatik.uni-oldenburg.de) .\" and Copyright 2008, Linux Foundation, written by Michael Kerrisk .\" .\" .\" SPDX-License-Identifier: GPL-1.0-or-later .\" .TH sincos 3 2023-10-31 "Linux man-pages 6.7" .SH NAME sincos, sincosf, sincosl \- calculate sin and cos simultaneously .SH LIBRARY Math library .RI ( libm ", " \-lm ) .SH SYNOPSIS .nf .BR "#define _GNU_SOURCE" " /* See feature_test_macros(7) */" .B #include .P .BI "void sincos(double " x ", double *" sin ", double *" cos ); .BI "void sincosf(float " x ", float *" sin ", float *" cos ); .BI "void sincosl(long double " x ", long double *" sin ", long double *" cos ); .fi .SH DESCRIPTION Several applications need sine and cosine of the same angle .IR x . These functions compute both at the same time, and store the results in .I *sin and .IR *cos . Using this function can be more efficient than two separate calls to .BR sin (3) and .BR cos (3). .P If .I x is a NaN, a NaN is returned in .I *sin and .IR *cos . .P If .I x is positive infinity or negative infinity, a domain error occurs, and a NaN is returned in .I *sin and .IR *cos . .SH RETURN VALUE These functions return .IR void . .SH ERRORS See .BR math_error (7) for information on how to determine whether an error has occurred when calling these functions. .P The following errors can occur: .TP Domain error: \fIx\fP is an infinity .I errno is set to .B EDOM (but see BUGS). An invalid floating-point exception .RB ( FE_INVALID ) is raised. .SH ATTRIBUTES For an explanation of the terms used in this section, see .BR attributes (7). .TS allbox; lbx lb lb l l l. Interface Attribute Value T{ .na .nh .BR sincos (), .BR sincosf (), .BR sincosl () T} Thread safety MT-Safe .TE .SH STANDARDS GNU. .SH HISTORY glibc 2.1. .SH NOTES To see the performance advantage of .BR sincos (), it may be necessary to disable .BR gcc (1) built-in optimizations, using flags such as: .P .in +4n .EX cc \-O \-lm \-fno\-builtin prog.c .EE .in .SH BUGS Before glibc 2.22, the glibc implementation did not set .\" https://www.sourceware.org/bugzilla/show_bug.cgi?id=15467 .I errno to .B EDOM when a domain error occurred. .SH SEE ALSO .BR cos (3), .BR sin (3), .BR tan (3)