Question: (a) Write an expression for a Riemann sum of a function f. Explain the meaning of the notation that you use. (b) If f (x)

(a) Write an expression for a Riemann sum of a function f. Explain the meaning of the notation that you use.
(b) If f (x) > 0, what is the geometric interpretation of a Riemann sum? Illustrate with a diagram.
(c) If f (x) takes on both positive and negative values, what is the geometric interpretation of a Riemann sum? Illustrate with a diagram.

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