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  • #78

Closed
Open
Created Jan 01, 2020 by Raymond Toy@rtoyOwner

Unneeded code in complex-acos

Describe the bug

The function complex-acos has this code:

  (if (and (realp z) (> z 1))
      ;; acos is continuous in quadrant IV in this case.
      (complex-acos (complex z -0f0))

AFAICT, this isn't actually needed. If you use eliminate this test and evaluate (acos 2) and (acos #c(2 -0.0), the results are the same: #c(0 1.3169578).

I'm pretty sure Kahan's algorithm is correct, without having this extra test.

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