# ASIN

Returns the arcsine, or inverse sine, of a number. The arcsine is the angle whose sine is number. The returned angle is given in radians in the range -pi/2 to pi/2.

## Syntax

ASIN(number)


### Parameters

Term Definition
number The sine of the angle you want and must be from -1 to 1.

## Return value

Returns the arcsine, or inverse sine, of a number.

## Remarks

To express the arcsine in degrees, multiply the result by 180/PI( ) or use the DEGREES function.

## Example

Formula Description Result
= ASIN(-0.5) Arcsine of -0.5 in radians, -pi/6 -0.523598776
= ASIN(-0.5)*180/PI() Arcsine of -0.5 in degrees -30
= DEGREES(ASIN(-0.5)) Arcsine of -0.5 in degrees -30