In Exercises 27–40: (a) Use a graphing utility to graph each equation in the standa...

In Exercises 27–40:

(a) Use a graphing utility to graph each equation in the standard viewing rectangle.

(b) Does the graph in part (a) appear to possess any of the three types of symmetry defined on page 59?

(c) In cases in which your answer to part (b) is Yes, adjust your viewing rectangle for a second, more careful inspection. (In Exercises 27–33, suggestions for the second look are provided.)

(d) In cases in which, after the second look, it still appears that the graph possesses symmetry, use an appropriate symmetry test from page 62 to settle the matter.