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:

# 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))

Output:

The value of cosine of pi/6 is : 0.8660254037844387

Code #2:

# 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()

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]