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I have 3 weeks to learn calculus 1. What topics do I absolutely need to know?

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The bad news is basically everything. The good news is, if you organize it right, that's almost nothing.

\- Limits: All the tricks except conjugation pretty much get replaced with L'Hopital. For graph or infinite problems, mostly use common sense.

\- Continuity: The only actual limit law is "if it's continuous, plug it in". You probably won't need the IVT.

\- Derivatives: What's to say? Know all the formulas. (That counts as one thing.)

(Implicit differentiation is just the chain rule, related rates are just word problems where you can use implicit differentiation as a shortcut.)

\- Applications: Optimization means look up Fermat's theorem. "Approximate" means "use tangent line instead of the function".

\- Conceptual stuff: All the theorems in the increasing/concavity/MVT chapter. You probably won't need them, or you'll cover them again in cal II.

More important going in is a mindset shift. The problems are open-ended, so you just have to accept that you will not immediately know how to do a problem at first no matter how good you get. That's fine. Try stuff. Also you'll use sum notation a lot in the beginning. Don't throw that out. It'll be essential for applications.
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There’s a 12 hour calculus 1 course on youtube where the professor explains really well! And even goes through the basics and fundamentals of algebra :) look up Calculus 1 College course on youtube and you’ll find it, its 12 hours long and I think it’ll be very useful to you
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Whaaat, no one is talking about integrals?
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Watch 3blue1browns series on calculus as a start to get some intuitive looks on the subject. Good luck.
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Khan Academy has some great videos and practice problems, but I also recommend 3b1b videos on calc, since he’s really great at exposing the intuition behind concepts
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How to calculate derivatives.  You don't really need the limits/continuity/difference quotient stuff.

Basic integrals, definite and indefinite.

Lots of algebra and trig.  Limits at infinity, trig identities, exponents and logs, rational expressions

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