Fix #2198 and #2199

[ecc521]

Fix #2198 and #2199

Take angle modulus 360 before multiplying my Math.PI to avoid issues with decimal accuracy when the angle measure gets large. (#2199)
Round to 10 digits using Math.round and division instead of stringifying (#2198). This should result in some performance improvements.

[adroitwhiz]

Thanks for fixing this! MathUtil.tan still stringifies + unstringifies, however--might want to get that fixed in this PR as well.

[ecc521]

Done.

[AmazingMech2418]

This seems good, I think. Only one thing that might be good is adding the modulus to the tangent as well, since that seems to have the same sorts of issues. Otherwise, I think this is ready to merge! Although it's apparently been ready to merge for almost 2 years now...

[ecc521]

@AmazingMech2418: Unless I'm missing something, tangent already does that (see MathUtil.tan - expand the second file being changed).

[AmazingMech2418]

@AmazingMech2418: Unless I'm missing something, tangent already does that (see MathUtil.tan - expand the second file being changed).

Yeah, I just saw that. You are correct.

[ecc521]

@cwillisf
Any reason this hasn't been merged yet?
This should be a very easy PR to review and merge, as it is 3 lines of code changes, and doesn't change any behaviors (beyond improving performance trivially and reducing calculation errors with large numbers)