Textbook ExpertVerified Tutor
18 Nov 2021
Given information
Given :- The function is 
To find :- Where does the graph of f have horizontal tangent ?
Step-by-step explanation
Step 1.
The horizontal tangents occur if the derivative of the function is zero.
Single Variable Calculus: Early Transcendentals
4th Edition, 2018
Stewart
ISBN: 9781337687805