ASN

Arc Sine

This numeric function returns the arc sine of an angle in radians.

Syntax

ASN (numeric-value [,ERR=line-ref|,ERC=error-code])

numeric-value: is any valid number from -1.0 through +1.0.
line-ref: is the program line number or label to branch to if an error is produced by this function.
error-code: is a programmer-defined error code. Valid values are positive or negative whole numbers.

This function returns a number that ranges from -1.57 through +1.57 (-Pi/2 to +Pi/2).

Note that ASN and SIN are reverse functions; that is:

ASN (SIN(x))=x
SIN (ASN(x))=x

If numeric-value exceeds the range indicated, an ERR=40 results.

ASN (0)

The result is 0.

ASN (1)

The result is 1.57 (i.e., Pi/2).

ASN (-1)

The result is -1.57 (i.e., -Pi/2).

These examples assume PRECISION 2.