#include <math.h>
float sinf(float x);
sinf returns the radian circular sine of x.
If |x| > 10^9, errno is set to EDOM and sin returns HUGE_VALF.
sinf returns x if x is NaN.
sinf returns NaN with invalid signal if |x| is ∞.
sinf conforms to ISO/IEC 9899:1990 (C90) and ISO/IEC 9899:1999 (C99).