Lec21: Arc length + average value of a function.
A lecture on how to compute the arc length of curves and how to find the average value of a function. Such ideas rely on integration and are seen in university mathematics.

Lec22: Surface area of revolution of functions.
A lecture on how to calculate the surface area of graphs that are revolved around an axis. Plenty of exampls are discussed and solved. Such ideas are seen in university, college and high school mathematics.

Lec23+24: Calculus revision lecture.
A revision lecture on a second calculus course, including: integration; partial derivatives; differential equations; series; sequences. A past exam with plenty of examples is discussed and solved.

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