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Add series representations of expm1 and atan

Zach Atkins requested to merge zach/ogden-vectorization into main

Summary

Adds a series representation for atan and updates the series representation of expm1 to save 3 flops. Neither of these are vectorized by clang.

Checklist

Closes #229 (closed)

  • Atomic commit history
  • All new features documented
  • Updated CHANGELOG.md

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