# ASIN

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

**Syntax**

**ASIN**(**number**)

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

**Remarks**

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

**Examples**

`ASIN(-0.5)`

equals -0.5236 (-p/6 radians)

`ASIN(-0.5)*180/PI()`

equals -30 (degrees)