Return how many integer grid points there are inside a 3D sphere of radius r centred at (0,0,0) (including points on the edge).
Neither string operations nor interpolations are allowed!
Get the area codes from a list of phone numbers
Remove NaN ?
Angle between two vectors
Flag largest magnitude swings as they occur
Hexagonal Tiling Dots in a Circle
Dots in a Diamond
Chebyshev polynomials of the 2nd Kind
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