Tutorial Gateway

Python cos

by

The Python cos function is one of the Python Math function which is used to calculate the Trigonometry Cosine for the specified expression. In this section, we discuss how to use cos function in Python Programming language with example.

The mathematical formula behind the Python Trigonometry Cosine function is

COS(x) = Length of the Adjacent Side / Length of the Hypotenuse

TIP: Please refer Python acos Function article to find the Arc Cosine of specified expression.

Syntax of a Python cos Function

The basic syntax of the cos Function in Python Programming Language is as shown below:

Math.cos(number);

Number: It can be a number or a valid numerical expression for which you want to find Cosine value.

  • If the number argument is positive or negative number, cos function return the Cosine value.
  • If the number argument is not a number, cos function return TypeError.

NOTE: The cos function return the value between -1 and 1.

Python cos Function Example

The Python cos Function allows you to find the trigonometry Cosine for the numeric values. In this example, We are going to find the Cosine values of different data types and display the output.

# Python cos Function

import math

Tup = (1, 2, 3, -4 , 5)
Lis = [-1, 2, -3.5, -4 , 5]

print('Cosine value of Positive Number = %.2f' %math.cos(10))
print('Cosine value of Negative Number = %.2f' %math.cos(-15))

print('Cosine value of Tuple Item = %.2f' %math.cos(Tup[3]))
print('Cosine value of List Item = %.2f' %math.cos(Lis[2]))

print('Cosine value of Multiple Number = %.2f' %math.cos(10 + 20 - 40))
print('Cosine value of String Number = ', math.cos('Hello'))

OUTPUT

Python COS Function

ANALYSIS

First, We declared Python List and Tuple with some random values. Next, We used the cos Function directly on both the Positive integer and negative integer. Following statements find the Cosine of the corresponding values.

print('Cosine value of Positive Number = %.2f' %math.cos(10))
print('Cosine value of Negative Number = %.2f' %math.cos(-15))

Next, We used the cos Function on Python Tuple and List items. If you observe the above screenshot, cos function is working perfectly on them.

print('Cosine value of Tuple Item = %.2f' %math.cos(Tup[3]))
print('Cosine value of List Item = %.2f' %math.cos(Lis[2]))

Next, We used the cos Function directly on multiple values.

print('Cosine value of Multiple Number = %.2f' %math.cos(10 + 20 - 40))

Within the last statement, We tried cos Function on String value. As we said before, it returns TypeError as output

print('Cosine value of String Number = ', math.cos('Hello'))