Textbook ExpertVerified Tutor
11 Nov 2021
Given information
Note that given a function .
Step-by-step explanation
Step 1.
Know that according to Fermat's Theorem: if has a local maximum or minimum at and is differentiable at . If a function has a local maximum or minimum at a point , then its tangent at that point (if it has one) must be a horizontal line, according to this theorem.