adds div and simplifications for div, mod and rem #418
+113
−16
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I also added a bunch of tests, which highlight the simplifications added.
There are still some simplifications that can be included. I will work on those, but I think/hope this is a good start.
I haven't added anything to the documentation either. I can work on that later once I figure out how it is deployed.
Let me know if there is anything I should do differently. In particular regarding the way I added the rules to
default_simplifier
. I wanted to do minimal changes to that, but I suspect separating div/rem/mod from trig/exp simplifications might be best since they will certainly be less used.