Fri, 19 Aug 2011 18:08:05 -0700 remove unused lemma DERIV_sin_add
huffman [Fri, 19 Aug 2011 18:08:05 -0700] rev 44318
remove unused lemma DERIV_sin_add
Fri, 19 Aug 2011 18:06:27 -0700 remove redundant lemma lemma_DERIV_subst in favor of DERIV_cong
huffman [Fri, 19 Aug 2011 18:06:27 -0700] rev 44317
remove redundant lemma lemma_DERIV_subst in favor of DERIV_cong
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