1. Sketch a graph of the function y= cos" x . Part I: First, sketch at least two periods of the function y= cosx on the graph below. (2 points) 10- - 10 10 -10- Part II: What are the domain and range of the function y= cos x? (2 points) Part III: Restrict the domain of the function y= cosx so that it may be inverted and draw the reflection of this new graph of y= cosx across the line y = x. This is a graph of the function y= cos-1 x (6 points) 10- -10 10 -10-2. Part I: Evaluate the expression Arctan(-