asin, asinf, asinl - Arc sine

Definition	#include <math.h> double asin(double x); float asinf(float x); (C11) long double asinl(long double x); (C11) asin is the inverse function of sin and calculates the corresponding angle in radians for a number in the interval [-1.0, +1.0]. These functions are the inverse function of the corresponding sin-functions. They return the principal value (i.e. corresponding angle in radians) of the arc sine of a floating-point number x in the range [-1.0, +1.0].
Return val.	arc sine(x)	a floating-point number of type double within [-pi/2, +pi/2] for values x in the interval [-1.0, +1.0].
	0	for values outside of [-1.0, +1.0]. In addition, errno is set to EDOM (domain error, i.e. argument too large).
Example	The following program calculates and prints the corresponding arc sine values for 0.0, 0.1,..., 1.0: #include <math.h> #include <stdio.h> int main(void) { double x; for(x = 0.0; x < 1.0; x = x + 0.1) printf("x = %g : asin(%g) = %g\n", x, x, asin(x)); return 0; }
See also	sin, cos, acos, tan, atan, atan2