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Desmos is so incredibly powerful while still being simple and playful. I wish I'd had it when I was in school.

The eldest is learning about exponents and logarithms and his course covers e, but they introduced it by just dumping the formula for continuously compounded interest on them without explaining what or why.

So we built some numerical differentiation in desmos to explore with. It's quite fun to play with moving the tangent, then guess the derivative from that.

https://www.desmos.com/calculator/1u5pogdrkt