Python | math.cos() function

In Python, math module contains a number of mathematical operations, which can be performed with ease using the module. math.cos() function returns the cosine of value passed as argument. The value passed in this function should be in radians.

Syntax: math.cos(x)

Parameter:
x : value to be passed to cos()



Returns: Returns the cosine of value passed as argument

Code #1:

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# Python code to demonstrate the working of cos()
     
# importing "math" for mathematical operations 
import math 
    
a = math.pi / 6
     
# returning the value of cosine of pi / 6 
print ("The value of cosine of pi / 6 is : ", end ="") 
print (math.cos(a)) 

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Output:


The value of cosine of pi/6 is : 0.8660254037844387





 

Code #2: 













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# Python program showing  


# Graphical representation of  


# cos() function  


import math 


import numpy as np 


import matplotlib.pyplot as plt  


  


in_array = np.linspace(-(2 * np.pi), 2 * np.pi, 20) 


  


out_array = [] 


  


for i in range(len(in_array)): 


    out_array.append(math.cos(in_array[i])) 


    i += 1


  


   


print("in_array : ", in_array)  


print("\nout_array : ", out_array)  


  


# red for numpy.sin()  


plt.plot(in_array, out_array, color = 'red', marker = "o")  


plt.title("math.cos()")  


plt.xlabel("X")  


plt.ylabel("Y")  


plt.show()  



















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Output:



in_array :  [-6.28318531 -5.62179738 -4.96040945 -4.29902153 -3.6376336  -2.97624567

 -2.31485774 -1.65346982 -0.99208189 -0.33069396  0.33069396  0.99208189

  1.65346982  2.31485774  2.97624567  3.6376336   4.29902153  4.96040945

  5.62179738  6.28318531]


out_array :  [1.0, 0.7891405093963934, 0.2454854871407988, -0.40169542465296987, -0.8794737512064891, -0.9863613034027223, -0.6772815716257412, -0.08257934547233249, 0.5469481581224268, 0.9458172417006346, 0.9458172417006346, 0.5469481581224268, -0.0825793454723316, -0.6772815716257405, -0.9863613034027223, -0.8794737512064893, -0.40169542465296987, 0.2454854871407988, 0.7891405093963934, 1.0]






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