Secret math trick to solve a Putnam question without calculus!

This is adapted from the 1994 Putnam, A2. Thanks to Nirman for the suggestion! Thanks to Tony, Nestor and Puggan for alerting me of an error in my original video.

Putnam 1994, A2 solution, John Scholes
https://prase.cz/kalva/putnam/psoln/p...

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