Parameters :
array: [array_like] elements are in radians.
2pi Radians = 360 degrees
Return:
An array with trignometric cosine of x for all x ie array elements
Code # 1: Work
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Output:
Input array: [0, 1.5707963267948966, 1.0471975511965976, 3.141592653589793] Cosine values: [1.00000000e + 00 6.12323400e-17 5.00000000e-01 -1.00000000e + 00]
Code # 2: Graphic representation
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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. 0.78914051 0.24548549 -0.40169542 -0.87947375 -0.9863613 -0.67728157 -0.08257935 0.54694816 0.94581724 0.94581724 0.54694816 -0.08257935 -0.67728157 -0.9863613 -0.87947375 -0.40169542 0.24548549 0.78914051 1.]

Links:
https://docs.scipy.org/doc/numpy-dev/reference/generated/numpy.cos.html#numpy.cos
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