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# Differentiation of Transcendental Functions | IntMath forum

- derivative of log function [Solved!]

In the chapter Derivative of the Logarithmic Function, Example #6, is it necessary to apply...**phinah**29 Aug 2017, 07:07 - Re: Differentiating tanh [Solved!]

I think it's Put `u=x-9` so `y= tanh u`. Then `dy/dx = dy/(du) (du)/dx` ` = (1-tanh^2 u)(du)/dx...**Haida**27 Nov 2015, 01:38