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# Python math.acos() Method

### Python math.acos() Method

Python math.acos() Method returns the arc cosine value (in radians) of the given number and it is used to get the arc cosine number between -1 to 1.

Syntax:
`math.acos(x)`

### Parameter Values

Parameter Description
X It is Required a number to find the arc cosine of, in the range -1 to 1.
Here is an Example of Python math.acos() Method:
``````
import math
print (math.acos(0.34))
print (math.acos(-0.23))
print (math.acos(1))
print (math.acos(0))
print (math.acos(-1))
```
```
Output:
1.2238794292677349
1.80287400965761
0.0
1.5707963267948966
3.141592653589793
Example 2:
``````
import math
a = -1
print("acos(",a,") is = ", math.acos(a))
a = -1
print("acos(",a,") is = ", math.acos(a))
a = 0.256
print("acos(",a,") is = ", math.acos(a))
a = 1
print("acos(",a,") is = ", math.acos(a))
```
```
Output:
acos( -1 ) is = 3.141592653589793
acos( -1 ) is = 3.141592653589793
acos( 0.256 ) is = 1.3119142931291623
acos( 1 ) is = 0.0