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Tool to calculate the domain of definition of a function f(x), ie. the set of values x which exists through the derivative f'(x).

Answers to Questions

How to calculate the domain of derivative of a function?

Calculating the derivation domain of a function is to calculate the set of definition of its derivative function. Check in $ \mathbb {R} = ] -\infty; +\infty [ $, the values for which the derivative function is not defined. That is, the values of $ x $ such that $ f'(x) $ does not exist.

The calculation of the derivation domain is thus composed of 2 steps:

Step 2: Calculate the definition domain of the derivative calculated at step 1

Example: $ f(x) \ln(x) = \log(x) $ is defined over $ \mathbb {R}^{*+} = ] 0 ; +\infty [ $, its derivative is $ f'(x) = \frac{1}{x} $. Which definition domain is $ \mathbb{R}^* = ] -\infty; 0 [ \cup ] 0; +\infty [ $

What is the domain of derivability of a rational function?

A rational function of the form $ f(x) = \frac{P(x)}{Q(x)} $ has the same definition domain as its derivative. So any rational function is derivable on its own domain of definition.

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