# @ASin (Formula Language)

Calculates the arc (inverse) sine using the sine of an angle.

## Syntax

**@ASin( ** *sine * **)**

## Parameters

*sine*

Number or number list. A sine of an angle, from -1 through 1.

## Return value

*angle*

Number or number list. An angle, in radians, from -pi/2 through pi/2. This represents an angle between -90 and 90 degrees.

## Usage

If the parameter is a list, the function operates on each element of the list, and the return value is a list with the same number of elements.

## Examples

- This example returns pi/2.
`@ASin( 1 )`

- This example returns 0.72082 radians (41.3 degrees).
`@ASin ( 0.66 )`

- This example returns pi/2 and 0.72082 radians in a list.
`@ASin ( 1 : 0.66 )`