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Basically, TI bought into the (also a con) textbook industry to get pictures showing students how to use its calculator, and now schools mandate that students buy TI's specific calculator - a product that has pretty much been the unchanged for 20 years, but at the same price as back then!
The worst part is, after school you'll never use it again
I've used mine for four years I think, got a simpler one before that.
I still have it, but never used it again after school.
Also, isn't there an app that does the same?
Sounds not too hard to make if you're into programming and fairly sufficient at math.
I mean, most functions are already provided by languages/frameworks, you just need to visualize it and there are plenty of plotting libraries already available.