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# Fallacies about the derivative of the trigonometric sine function

Citation

Toh, T. L., Tay, E. G., & Tong, C. L. (2021). Fallacies about the derivative of the trigonometric sine function. The Mathematician Educator, 2(1), 1-10. https://ame.org.sg/2021/07/02/tme2021-vol-2-no-2-pp-1-10

Abstract

In this paper, several fallacies about the extension of the formula \frac{d}{dx} (\sin x) = \cos x to the erroneous formula \frac{d}{dx} (\sin x^\circ) = \cos x^\circ are discussed. In a Commognitive Theory Framework, misconceptions by ‘newcomers’ can be traced to the use of the word “unit”.

Date Issued

2021

Journal

The Mathematician Educator