# Acos

### **Description**‌

The Acos function returns the arc cosine of a number.

### **Syntax**

‌The syntax for the Acos function is:

`math.Acos(x)`

#### ‌**Parameters**

x - numeric value. X must be between -1 to 1.

### **Returns**

‌The Acos function returns a number.

### **Applies To**‌

Flow 6‌.14

### **Example**‌

Let's look at some Acos function examples and explore how to use the Acos function.‌

```
Return Math.Acos(1) = 0
```