YouTipFunc Number Acos 2
# Python2.x Python acos() Function
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## Description
**acos()** returns the arc cosine of x, in radians.
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## Syntax
Here is the syntax for the acos() method:
import math math.acos(x)
**Note:** acos() cannot be accessed directly. You need to import the math module and then call this method using the math static object.
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## Parameters
* x -- A numeric value between -1 and 1. If x is greater than 1, it will produce an error.
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## Return Value
Returns the arc cosine of x in radians.
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## Example
The following example shows the usage of the acos() method:
#!/usr/bin/pythonimport 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)
The output of the above program is:
acos(0.64) : 0.876298061168 acos(0) : 1.57079632679 acos(-1) : 3.14159265359 acos(1) : 0.0
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