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The NumPy cos() function is used to calculate trigonometric cosine of given angle in radians.


numpy.cos(x, out=None)


x Required. Specify array (array_like) containing elements as angles in radians of which the trigonometric cosine is calculated.
out Optional. Specify a location into which the result is stored. If provided, it must have a shape that the inputs broadcast to. If not provided or None, a freshly-allocated array is returned.

Return Value

Returns the cosine of each element of x.


In the below example, numpy cos() function is used to calculate the cosine of each element present in array Arr.

import numpy as np

Arr = np.array([0, 30, 60, 90])
#converting the angles in radians
Arr = Arr*np.pi/180

print("The cos value of angles:")

The output of the above code will be:

The cos value of angles:
[  1.00000000e+00   8.66025404e-01   5.00000000e-01   6.12323400e-17]

❮ NumPy - Functions