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Comparing Callahan and Derek Owens for Geometry

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Can anyone help me compare/contrast these two? I read some older posts with some information--looking for anything further or more recent.


1. They both use the same edition/same book of Jacob's Geometry. 


2. Both use pre-recorded classes (DVD vs online)


3. Derek Owens can do all grading? Or do I have to grade/check daily work?


4. Dr Callahan is available for help if you get stuck on a problem.


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