Differentiation rules
This article is a summary of differentiation rules, that is, rules for computing the derivative of a function in calculus. == Elementary rules of differentiation == Unless otherwise stated, all functions are functions of real numbers ( R {\textstyle \mathbb {R} } ) that return real values, although, more generally, the formulas below apply wherever they are well defined, including the case of complex numbers ( C {\textstyle \mathbb {C} } ).