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A comment on Many elementary teachers don’t understand math, and it makes them anxious. Parent comment

Re:Many elementary teachers don’t understand math, and it ma... by smabie on Saturday November 30, 2019 @05:53AM (#21669452)
Because the derivative at 0 of abs is undefined.
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Re:Many elementary teachers don’t understand math, and it ma... by chrisseaton on Saturday November 30, 2019 @07:00AM (#21669599)
Why do I care about that though?
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Re:Many elementary teachers don’t understand math, and it ma... by smabie on Saturday November 30, 2019 @09:32AM (#21670098)
Taylor series, calculating maxima/minima, etc. also standard deviations compose in a very nice way. All throughout math, we use squared terms instead of absolute value all the time because it’s convenient.
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