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Calculus I toughest concepts for students?

From your Calculus I experience, which Calculus I concept do you think Calculus students struggle with? How would you best explain it?  

1. Community
2. Study Group

Calculus I toughest concepts for students?

From your Calculus I experience, which Calculus I concept do you think Calculus students struggle with? How would you best explain it?  

1. Community
2. General Khan Academy Questions