Add all of the Num trig functions back in.
Add all of the Num trig functions back in.

WARNING: Unfortunately, the trig spec tests are well beyond ng's capabilities at the moment.  atan, sin, cos, tan, sec, asin, and acos pass the basic tests from the old trig test suite (not counting the Inf tests, which all fail hard).  The rest are basically untested at this point.  I think I forgot to even implement atan2.

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