#include <stdbool.h>

float sqrtf(float);
float cosf(float);
float sinf(float);
float atan2f(float, float);
bool isnan(float);
bool isinf(float);
double floor(double x);
double ceil(double x);
double sqrt(double x);
double pow(double x, double y);
double fmod(double x, double y);
double cos(double x);
double acos(double x);
double fabs(double x);
int abs(int);
double ldexp(double, int);
double exp(double);
double log(double);
double sin(double);