Geodesic
On computing the derivative of a function
The Teaching of Mathematics, XVI (2013) no. 1, p. 6 .

Voir la notice de l'article provenant de la source eLibrary of Mathematical Institute of the Serbian Academy of Sciences and Arts

This note discusses a fact and its application on examining the existence of a derivative of a function at a point. The application provides a relatively easier method while avoiding laborious computations when standard computing is used. This may be introduced as a part of applications of the derivative in a Calculus course.
Classification : 1AMS97I40 2ZDMI45
Keywords: functions, derivatives, mean value theorem. 
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Haryono Tandra. On computing the derivative of a function. The Teaching of Mathematics, XVI (2013) no. 1, p. 6 . http://geodesic.mathdoc.fr/item/TM2_2013_XVI_1_a1/