HP C/iX Library Reference Manual (30026-90004)

Chapter 5 107
HP C/iX Library Function Descriptions
asin
asin
Returns the arc sine of the input value in radians.
Syntax
#include math.h>
double asin (double x );
Parameters
x A real number.
Return Values
n The arc sine of x .
0 The magnitude of the argument of asin is greater than one or less than
negative one. errno is set to EDOM.
Description
The asin function returns the arc sine of x , in the range of −pi/2 to pi/2.
A DOMAIN error is printed on the standard error output if
x is greater than one or less than
negative one.
Error-handling can be changed by a user-written matherr function.
See Also
matherr(), ANSI C 4.5.2.2, POSIX.1 8.1