Cheap Knock-offs

My math class is doing derivatives via basic differentiation rules after suffering through doing them “the long way” (the limit process that apparently produces many groans and bad test grades).

So Mr. Riley taught us a cute math rhyme for doing the derivative of (u/v):

> Lo-dee-hi minus hi-dee-lo,
> Over the square of what goes below.
>
> derivative formula for u/v

So totally awesome.

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