you should ease up numerically on equality, so my solution works :)
The polar inertia is the sum of the squared distances of all points from the origin. https://en.wikipedia.org/wiki/Polar_moment_of_inertia
Find common elements in matrix rows
Distance walked 1D
give nth decimal place of pi
Square Digits Number Chain Terminal Value (Inspired by Project Euler Problem 92)
Calculate the derivative of a polynomial
Use of regexp
surface of a spherical planet
pressure to dB?
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