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Here’s what my students say about Calculus Expert:

 
I just wanted to pass calculus because I know it’s hard and it’s needed for engineering… I really appreciate how you never skip a step no matter how minor it is.
Krista’s the best, and she skips the BS in the exact way my professors will not
I wish you were my prof through applied linear algebra!
I never feel overwhelmed or bored with the courses. I’m learning at just the right pace.
Thank you for following the calculus curriculum so closely. Your explanations are so much easier to understand than my textbook.
It helped me turn around my calculus grade. I went from having a C in calculus 1 to A’s in calculus 2 and 3, and I am also using the site to review concepts on geometry and algebra for the GRE
The PDF notes are AWESOME!