What is the magnitude of a-b?

Graph g(x)=2cosx . use 3.14 for π . use the sine tool to graph the function. graph the function by plotting two points. the first point must be on the midline and closest to the origin. the second point must be a maximum or minimum value on the graph closest to the first point.

Can someone me with the property questions for 12 13 and 14 plz

What is the result of the following division?