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C

/*
* Copyright (c) 2006-2018, RT-Thread Development Team
*
* SPDX-License-Identifier: Apache-2.0
*
* Change Logs:
* Date Author Notes
*/
#ifndef __MATH_H__
#define __MATH_H__
#define M_PI 3.141592653589793238462643
double sin(double x);
double cos(double x);
#endif