Going up to Calculus 3 (Multivariate Calculus), Differential Equations, and Linear Algebra is great but an important concept in Math is doing proofs. There should be a series on proof methods and proving the calculus theorems etc.
I completely understand how a lesson in proofs would make your time on Khan Academy more productive. I have gone ahead and passed your feedback along to our content team so they can use it as we plan for the future of Khan Academy.
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