So I'm flipping through the frames and I come to one where I was trying to explain how the slope of a vertical line is undefined, which I completely had forgotten about...
(Now with 100% less titlefail!)
A collection of lessons that I like from my class, or that I've found through the magic of the internets.
The poor guy's been hanging on there for a year now. How about throwing him a (horizontal) line?!
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