4. Exactly one of the following three functions can be easily integrated using integration by substi tution. Identify which one, and then compute the integral, showing all of your work. . ferdx 5. Use an integral to compute the volume of the solid obtained by rotating the area under the line segment from (0, 0) to (3, 3) about the x-axis. Show all of your work, and do not use the formula for the volume of a cone