Implementing cosine in C from scratch 7/19/2020 Update 7/20: See the discussion of this post on Reddit. Update 3/22: See more discussion of this post on Hacker News and Reddit. Update 6/23: See even more discussion of this post on Hacker News. TL;DR: I explored how to implement cosine using a few different approaches. One of the implementations is nearly 3x faster than math.h if you are ok with 4
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