# Python Number Acos() Method

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## Description

The acos() method in Python number refers to the library method of its math module and is used to obtain the arc cosine. It accepts a number that lies between -1 to 1 and also returns the arc cosine value (in radians) of the specific number

### Syntax

Here is the syntax for acos() method:

`acos(x)`

Note - One cannot access this function directly, so it is required to import the math module in Python, and then we are supposed to call this function making use of the math static object.

### Parameters

• x - This should be a numeric value lying in the range -1 to 1. In case x is greater than 1 then it would generate an error.

### Return Value

This method thus returns the arc cosine of x, into radians.

### Example

The example below shows the usage of acos() method.

```#!/usr/bin/python
import math

print "acos(0.64) : ",  math.acos(0.64)
print "acos(0) : ",  math.acos(0)
print "acos(-1) : ",  math.acos(-1)
print "acos(1) : ",  math.acos(1)```

When the above program is run, it produces the following result:

```acos(0.64) :  0.876298061168
acos(0) :  1.57079632679
acos(-1) :  3.14159265359
acos(1) :  0.0```

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