chebfun/chebfun — pull request #1299 by gradywright (2014-12-01 18:16:05+00:00)
Title: Rewrite of trigtech/simplify and fixes a bug in simplification of identically-zero trigtechs 

Rewrite of `trigtech/simplify` to conform to the new arrangement of coefficients from negative powers to positive powers. Also fixes a bug where a zero `trigtech` was not being simplified to have length zero. This was fixed for `chebtech` in #1284, but not for `trigtech`.