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1:24:21

5-5 Indefinite Integrals and the substitution rule, 5-6 Substitution and Area between curves

45:43

7-3 Exponential Function

1:30:55

4-2，4-3：The Mean Value Theorem，Monotonic Function and The First Derivative Test

28:23

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46:40

4-4: Concarity and Curve Sketching

21:41

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From Raw Wood to Masterpiece: The Magic of Woodturning