WeBWorK using host: https://webwork.libretexts.org, format: sticky seed: 123567

Suppose that
[math]
(A) Find an equation for the tangent line to the graph of [math] at
[math].

Tangent line: [math] =

(B) Find all values of [math] where the tangent line
is horizontal (enter these values separated by commas, if needed).
If there are no such values, enter NONE.