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Corrections for angle between two lines
1. another fact by CWoo on 2007-05-29 16:51:18 (accepted)
2. perpendicular lines by CWoo on 2007-05-29 16:45:00 (accepted)
3. largest angle between two lines by Wkbj79 on 2007-05-29 16:34:23 (accepted)

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