Incorrect results from acos

[Former user]

Originally reported on Google Code with ID 111

What steps will reproduce the problem?
1. Enter acos(-0.8)
2.
3.

What is the expected output? Approx 143 degrees What do you see instead?
-37 approx


What version of the product are you using? On what operating system? Ubuntu.


Please provide any additional information below.
It is giving -acos(0.8) when it ought to give 180-acos(0.8)

Reported by campbell.ritchie on 2007-10-29 14:58:38

[Former user]

``` problem of version 0.8 and earlier only. The new engine in version 0.9 and trunk returns 143 degrees

```

Reported by `wolf.lammen` on 2007-10-29 20:44:40 - Status changed: `Fixed`

[Former user]

Reported by `helder.pereira.correia` on 2007-10-29 20:50:39 - Labels added: Milestone-0.9