> In this example again we've separated out a mathematical transformation from
> how it is used. We can build a strategy
> "apply-all-these-rules-cleverly-so-that-they-minimize-this-function(fn,
> *rules)" and then just throw in the rules we care about. If we

btw, this is how the Fu algorithm for trig simplification works. It is
programmed with various sets of rules that get applied to an
expression.

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