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Estimate the area under the graph of f(x) = 10cos(x) from x = 0 to x = pi/2 using four approximating rectangles and right endpoints. (Round the...

Estimate the area under the graph of f(x) = 10cos(x) from x = 0 to x = pi/2 using four approximating rectangles and right endpoints. (Round the answer to four decimal places.)

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