_CODE_ACCESS & sin __relaxed_sin

Dear team,

The device is TMS320F28379D. The doubts encountered when calling the sine and cosine functions in math.h:

#define sin __relaxed_sin
__inline double __relaxed_sin(double x)
{
return __sin(x);
}
#define cos __relaxed_cos
__inline double __relaxed_cos(double x)
{
return __cos(x);
}

_CODE_ACCESS double      cos(double x);

_CODE_ACCESS double      sin(double x);

What is the difference between them? 

4213.math.h