asin, asinf, asinl - arc sine function
#include <math.h>
double asin(double x);
float asinf(float x);
long double asinl(long double x);Link with -lm.
Feature Test Macro Requirements for glibc (see feature_test_macros(7)):
These functions calculate the principal value of the arc sine of x; that is the value whose sine is x.
On success, these functions return the principal value of the arc sine of x in radians; the return value is in the range [-pi/2, pi/2].
If x is a NaN, a NaN is returned.
If x is +0 (-0), +0 (-0) is returned.
If x is outside the range [-1, 1], a domain error occurs, and a NaN is returned.