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13. Suppose f (x, y) is a function of two variables. It is sometimes said that x = es cost and y = es sint

13. Suppose f (x, y) is a function of two variables. It is sometimes said that x = es cost and y = es sint are 'exponential polar coordinates'. Show that in exponential polar coordinates, we have fax+ fyy = e-28(fss + fit)

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