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Some of the more recent implementations of cosine for single precision that are correctly rounded to all rounding modes according to IEEE 754 standard:

- The CORE-MATH project: https://gitlab.inria.fr/core-math/core-math/-/blob/master/sr...

- The RLIBM project: https://github.com/rutgers-apl/The-RLIBM-Project/blob/main/l...

- The LLVM libc project: https://github.com/llvm/llvm-project/blob/main/libc/src/math...