Solution

ID: past-exam-of-the-mathematics-course-of-the-year-1-of-the-natural-sciences-course-of-the-university-of-cambridge/2009/paper-1/8/a/solution

The graph is nonnegative, tends to as and as , and vanishes only at . Its derivative is , negative before one and positive after one, so is the unique global minimum. The second derivative is : the graph is convex for and concave for , with an inflection point at . These features determine the sketch in the left panel.
Figure 1.
The squared logarithm, the half-amplitude double-frequency sine, and the directed elliptical path
. Details.

New to topics? Read the docs here!