1 /* 2 * Copyright (c) 2006-2018, RT-Thread Development Team 3 * 4 * SPDX-License-Identifier: Apache-2.0 5 * 6 * Change Logs: 7 * Date Author Notes 8 */ 9 #ifndef __MATH_H__ 10 #define __MATH_H__ 11 12 #define M_PI 3.141592653589793238462643 13 14 double sin(double x); 15 double cos(double x); 16 17 #endif 18