Posted by **christina** on Sunday, November 24, 2013 at 11:10pm.

The area A of the region S that lies under the graph of the continuous function is the limit of the sum of the areas of approximating rectangles.

A = lim n → ∞ [f(x1)Δx + f(x2)Δx + . . . + f(xn)Δx]

Use this definition to find an expression for the area under the graph of f as a limit. Do not evaluate the limit.

f(x) = 7x cos(7x), 0 ≤ x ≤ π/2

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