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For both vector and scalar routines we reduce the order from 6 to
5. For vector routines, this requires reducing RangeVal as for large
values the tan polynomial is not quite accurate enough. However the
cotan polynomial is used in the inaccurate region in the scalar
routine, so this does not need to change.
Accuracy of scalar routine is unchanged. Accuracy in both vector
routines is now 3.45 ULP, with the same worst-case.
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All files in pl/math updated to 2023.
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Correct a couple of spelling mistakes in the comments in two separate files.
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Fast implementation using reduction to [0, pi/4] using
approximation of cotan to allow for early reciprocal
computation.
The maximum error is 3.293ulps and is observed for a large
input equal to 0x1.c849eap+16, about 116809.91.
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