# Special derivatives

Now that you know a few special derivatives, practice putting them into context.

### Problem

Consider the graph of space, y, equals, 2, x, minus, tangent, x, space for $~x\in [-1.25,1.25]\,$. A graph is shown with two horizontal tangents.
What are the exact arguments space, x, space at which the graph has horizontal tangents?
Select all that apply.
Select all that apply.
Get first 4 correct, or 5 in a row.