asin

Syntax

#include <math.h> double asin(double x);

Description

This function returns the angle in the range [-Pi/2..Pi/2] whose sine is x.

Return Value

The inverse sine, in radians, of x. If the absolute value of x is greater than 1, the return value is NaN and errno is set to EDOM.

Portability

ANSI/ISO C	C89; C99
POSIX	1003.2-1992; 1003.1-2001