Python Number cos() Method

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Description

Python number method cos() returns the cosine of x radians.

Syntax

Following is the syntax for cos() method −

cos(x)

Note − This function is not accessible directly, so we need to import math module and then we need to call this function using math static object.

Parameters

• x − This must be a numeric value.

Return Value

This method returns a numeric value between -1 and 1, which represents the cosine of the angle.

Example

The following example shows the usage of 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)

When we run above program, it produces following result −

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