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I have devised (automatically, I have just let it grow) an algorithm, which enlists all the leap years in the Gregorian calendar using the Cosine function. Scraping the ugly constants of 100 and 400.
Here
I'm having difficulty envisioning what problem this solves. Leap years are already defined by a very simple function, and subbing in a cosine for a discrete periodicity adds complexity, does it not?