Like We're Not Enemies
After a full limit-definition derivation that d/dx x² = 2x, a student asks for it again, but like we're not enemies.
Transcript
[Board: the limit definition of the derivative of x², from lim (x+Δx)² − x² over Δx down to 2x] "Can you explain that again, but like we're not enemies?"
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Free for classrooms, worksheets, slides and other non-commercial use under CC BY-NC 4.0, with credit to Ben Orlin.
Cartoon by Ben Orlin, Math with Bad Drawings. https://cartoons.mathwithbaddrawings.com/2019-10-08-like-we-re-not-enemies/ (CC BY-NC 4.0)