# ASIN function

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)

Number     is the sine of the angle you want and must be from -1 to 1.

Remark

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

Example

The example may be easier to understand if you copy it to a blank worksheet.

1. Create a blank workbook or worksheet.
2. Select the example in the Help topic.

Note   Do not select the row or column headers.

Selecting an example from Help
1. Press CTRL+C.
2. In the worksheet, select cell A1, and press CTRL+V.
3. To switch between viewing the results and viewing the formulas that return the results, press CTRL+` (grave accent), or on the Formulas tab, in the Formula Auditing group, click the Show Formulas button.
A B
Formula Description (Result)
=ASIN(-0.5) Arcsine of -0.5 in radians, -pi/6 (-0.5236)
=ASIN(-0.5)*180/PI() Arcsine of -0.5 in degrees (-30)
=DEGREES(ASIN(-0.5)) Arcsine of -0.5 in degrees (-30)

Applies to:
Excel 2007