Implement a new atan method that is 21 times faster.
The new method uses a table and the taylor series for atan to compute atan for real args. qd-const.lisp: o Add the two tables used for the atan computation. o Include clisp code that generates the tables. qd-fun.lisp: o Implement atan using a set of tables and a Taylor series. timing.lisp: o Add a simple timing program to evaluate how fast each atan method is.
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