+776 Wait for someone else's answer to confirm. I am not 100% sure.
+130077 Note that tan (2pi - x) =
sin (2pi - x) sin2pi * cosx - cos2pi *sinx
_________ = _______________________ =
cos (2pi - x) cos2pi *cosx + sin 2pi * sinx
- sin x
_____ =
cos x
- 2 / sqrt (29)
___________ =
5 / sqrt (29)
-2/5
Just as PM found.......!!!!
+776 Why is mine the best answer? I forgot to explain, and your answer, CPhill, explained everything clearly and brilliantly. I give CPhill's answer the title of Best Answer. 
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