October 2018
Beginner
250 pages
12h 14m
English
The derivative of a function
at a point
, when defined, is the tangent to the function at
. Formally

The function is said to be ‘differentiable at
’ if the limit exists and takes the same value for
and
. The derivative at
is also written for brevity as
.
Rules for differentiation include the following:
