Describe a region whose signed area is equal to the following limit. (m) (부) n 3Ti 37 E cos lim -ㅠ + n n i=1

Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
Publisher:Erwin Kreyszig
Chapter2: Second-order Linear Odes
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**Problem 4**: Describe a region whose signed area is equal to the following limit.

\[
\lim_{n \to \infty} \sum_{i=1}^{n} \cos \left(-\pi + \left(\frac{3\pi i}{n}\right)\right) \left(\frac{3\pi}{n}\right)
\]

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The expression represents the signed area under the cosine curve over an interval. This is calculated as a limit of a Riemann sum. Each term in the sum represents the area of a thin rectangle, with width \(\frac{3\pi}{n}\) and height given by the cosine of \(-\pi + \left(\frac{3\pi i}{n}\right)\). As \(n\) approaches infinity, the sum approximates the definite integral of the cosine function from \(-\pi\) to \(2\pi\). The result is the total signed area under the curve over this interval.
Transcribed Image Text:Sure! Here is the transcription of the text for an educational website: --- **Problem 4**: Describe a region whose signed area is equal to the following limit. \[ \lim_{n \to \infty} \sum_{i=1}^{n} \cos \left(-\pi + \left(\frac{3\pi i}{n}\right)\right) \left(\frac{3\pi}{n}\right) \] --- The expression represents the signed area under the cosine curve over an interval. This is calculated as a limit of a Riemann sum. Each term in the sum represents the area of a thin rectangle, with width \(\frac{3\pi}{n}\) and height given by the cosine of \(-\pi + \left(\frac{3\pi i}{n}\right)\). As \(n\) approaches infinity, the sum approximates the definite integral of the cosine function from \(-\pi\) to \(2\pi\). The result is the total signed area under the curve over this interval.
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