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April 29, 2016
Posted by **Shin** on Tuesday, May 21, 2013 at 11:47am.

- Trigonometry -
**Steve**, Tuesday, May 21, 2013 at 11:57amx = (9±√41)/2

arctan(x) = 82.6° or 52.4°

Don't know how to evaluate the arctan directly; it appears not to be any familiar angle