Cosine of Degree Values in NumPy

John on September 17, 2021

To calculate trigonometric functions such as sine, cosine and tangent in Python we can use functions from the NumPy module such as np.cos(), np.sin() and np.tan().

To get cosine using NumPy our code would be:

import numpy as np

result = np.cos(0.8)

print(result)

0.6967067093471655

Cosine of Degree

To convert angle radians to degrees for use in the cos() function, we can pass it through np.radians() first like this:

import numpy as np

result = np.cos(np.radians(35))

print(result)

0.8191520442889918

An alternative is to use the NumPy deg2rad() function, which might be more readable to you.

import numpy as np

result = np.cos(np.deg2rad(35))

print(result)

0.8191520442889918