# math/asin Arc sine; returns an angle in radians. ## Syntax

[math/asin $x]

## Parameters - `$x` — Value in the range [-1, 1] ## Examples

[math/asin 0]    # 0
[math/asin 1]    # 1.5707963267948966 (π/2)

## Returns Number — angle in radians, in the range [-π/2, π/2]. ## See Also `math/acos`, `math/atan`, `math/sin`