Python cos() Function

Python Numbers

Description

cos()Returns the cosine of x radians.

Syntax

The following is the syntax of the cos() method:

import math

math.cos(x)

Note:cos() cannot be accessed directly; you need to import the math module, and then call the method via the math static object.

Parameters

• x -- A numeric value.

Return Value

Returns the cosine of x radians, between -1 and 1.

Example

The following example demonstrates the use of the cos() method:

#!/usr/bin/python
import math

print "cos(3) : ",  math.cos(3)
print "cos(-3) : ",  math.cos(-3)
print "cos(0) : ",  math.cos(0)
print "cos(math.pi) : ",  math.cos(math.pi)
print "cos(2*math.pi) : ",  math.cos(2*math.pi)

The output of the above example after running is:

cos(3) :  -0.9899924966
cos(-3) :  -0.9899924966
cos(0) :  1.0
cos(math.pi) :  -1.0
cos(2*math.pi) :  1.0

Python Numbers