Mon, 05 Sep 2011 12:19:04 -0700 huffman add lemmas cos_arctan and sin_arctan
(0) -30000 -10000 -3000 -1000 -300 -100 -30 -10 -1 +1 +10 +30 +100 +300 +1000 +3000 +10000 +30000 tip