#define PI 3.14159
#define TWOPI 6.28319
#define cos1 0.9950
#define sin1 0.09983

extern float cos(float x);
extern float sin(float x);
extern int abs(int x);
extern float fabs(float x);
extern float sqrt(float x);
extern float max(float a, float b);
extern float min(float a, float b);