I thought I had heard every silly mnemonic device for remembering mathematical formulas, but I recently heard a new one: the clowns BOBO, BOTU, and BETC for remembering how to graph rational functions.

BOB0: bigger (exponent) on bottom,

BOTU: bigger on top, undefined

BETC: bottom equals top eponent, coefficients (i.e., the ratio of coefficients)

I'm a Professor of Mathematics and a University Distinguished Teaching Professor at the University of North Texas. For eight years, I was co-director of Teach North Texas, UNT's program for preparing secondary teachers of mathematics and science.
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