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What are the best books to learn pre calculus?

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You're right that exercises seem to be the weak point for a lot of online educational material. This problem is just begging for a technological fix, and I hope some brainiac will soon turn their talents to automated exercise generation. After all, a lot of puzzle sites generate puzzle games at the click of a mouse; math exercises can't be all that much harder. (Yes, they are a certain amount harder, but this does not feel like an insurmountable problem to me.) But anyway, to answer the question you actually asked...

Because so many students study precalculus every year, the after-market in precalculus textbooks is *very active*. If you do a web search for "precalculus textbook", you will find many offered for sale; the first page of hits showed some offers for less than $10. I would imagine most textbooks to be more than adequate for your needs.

If you have literally *no money*, a number of online sources offer online precalculus textbooks for free. Some turn out to be come-ons to try to get you to buy something, but others seem to have no strings attached. There's enough variety for you to do a bit of trial-and-error until you find something that suits your needs.

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