1. Review the help on derivatives (Desmos ) Links to an external site. and the Derivatives in Action section (last item listed). 2. Using the examples in the Using Derivatives to Graph a Tangent Line section, in Desmos, plot the tangent line to the curve (b) from Discussion 1. 3. By moving the point along the graph from left to right, identify the intervals where the slope of the tangent line is: a) positive and b) negative; and identify the coordinates of all points for which the slope of the tangent line is: c) zero, and d) does not exist