Python math.cos() - Cosine Function
Python math.cos()
math.cos(x) function returns the cosine of x radians.
The return value lies in [-1, 1].
Syntax
The syntax to call cos() function is
math.cos(x)
where
Parameter | Required | Description |
---|---|---|
x | Yes | A numeric value that represents angle in radians. |
Examples
In the following example, we find the cosine of 0.5 radians using cos() function of math module.
Python Program
import math
x = 0.5 #radians
result = math.cos(x)
print('cos(x) :', result)
Output
cos(x) : 0.8775825618903728
We can take angle in degrees and convert the degrees into radians using math.radians() function, and then find the cosine of this angle.
In the following program, we find the cosine of 60 degrees.
Python Program
import math
x = 60 #degrees
x = math.radians(x) #radians
result = math.cos(x)
print('cos(x) :', result)
Output
cos(x) : 0.5000000000000001
Summary
In this Python Examples tutorial, we learned the syntax of, and examples for math.cos() function.