The rectangular sheet of the examples in the previous section now has its sides at x = 0, x = a and y = b insulated and its edge at y = 0 maintained after time zero at a temperature of 350 K. If at time zero, the temperature throughout the sheet is 200 K, what is the temperature distribution in the sheet at all later times? [Hint: Think! What do you expect the x-dependence to be? What does this say about and ? Which possibility(ies) in the above table should you consider?]