Question: (a) Estimate the area under the graph of f(x) = cos x from x = 0 to x = /2 using four approximating rectangles and

(a) Estimate the area under the graph of f(x) = cos x from x = 0 to x = π/2 using four approximating rectangles and right endpoints. Sketch the graph and the rectangles. Is your estimate an underestimate or an overestimate?
(b) Repeat part (a) using left endpoints.

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