Need a better test suite to prevent cheesy solutions like this one. :-) Some N>10 values in there would help. N>50 would be even better.
Angle between Two Vectors
Volume of a Parallelepiped
Side of a rhombus
Spot the First Occurrence of 5
Crop an Image
Fractal: area and perimeter of Koch snowflake
Smallest n, for n! to have m trailing zero digits
Number of paths on a 3d grid
Make a rainbow matrix (follow-up to checkerboard matrix)
Equal temperament - musical notes and frequency
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