Apply the program in Prob. 25 to u = e^x cos y, v = e^x sin y and to an example of your own.

Data from Prob. 25

Write a program for graphing equipotential lines u = const of a harmonic function u and of its conjugate v on the same axes. Apply the program to

(a) u = x² - y², v = 2xy

(b) u = x³ - 3xy², v = 3x²y - y³.