OK. I'll bite. Where did this formula come from?
Just from calculating a number of values and figuring out the pattern.
That's quite the pattern to figure out...
Angle between two vectors
Permute diagonal and antidiagonal
Split a string into chunks of specified length
Right Triangle Side Lengths (Inspired by Project Euler Problem 39)
Area of an equilateral triangle
Get a new matrix by mapping each element of an arbitrary-sized input matrix using lookup table
Find the mean of a 2-D matrix after excluding elements of specified sub-matrix
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