# ASIN

Returns the arc sine of expression x.

ASIN(x)

## Description

The absolute value of x must be less than or equal to 1. The returned value ranges from $\left[-\pi /\text{2},\pi /2\right]$ . Thus $-\pi /2\le ASIN\left(x\right)\le \pi /2$ .

## Arguments

x
Any valid function expression.

## Example

<Reference_Variable
id                  = "1"
label               = "ASIN Example"
type                = "EXPRESSION"
expr                = "ASIN(AY(569,193))"
/>