Arc sine

[Classification]

Mathematical library

[Syntax]

#include <math.h>

double asin(double x);

[Return value]

Returns the arc sine (arcsine) of x. The returned value is in radian and in a range of -π / 2 to π / 2.

If x is not between -1 and 1, a NaN is returned, and macro EDOM is set to global variable errno.

[Description]

This function calculates the arc sine (arcsine) of x. Specify x as, -1 <= x <= 1.