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. 2019 Mar 12;10(3):183. doi: 10.3390/mi10030183

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© 2019 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

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Variations of $k$ under $u (t) = 5 \sin (2 π f t) + 5$ at different frequencies.