##
ASIN

The
ASIN function returns the angle, expressed in radians, whose sine is *
X*
(i.e., the
arc-sine). The range of ASIN is between -*
p*
/2 and *
p*
/2. Rules for the type and structure of the result are the same as those given for the ACOS function.

###
Calling Sequence

Result = ASIN(*
X*
)

###
Arguments

####
X

The sine of the desired angle, -1 *
<=*
*
X*
*
<=*
1.

###
Example

To print the arc-sine of 0.707, enter:

PRINT, ASIN(0.707)

IDL prints:

0.785247