Calculus 8th Edition

Published by Cengage
ISBN 10: 1285740629
ISBN 13: 978-1-28574-062-1

Chapter 14 - Partial Derivatives - 14.2 Limits and Continuity - 14.2 Exercises - Page 951: 29



Work Step by Step

Given: $f(x,y)=\frac{xy}{1+e^{x-y}}$ The given function is defined for all values of x and y except at $1+e^{x-y}=0$ This implies $e^{x-y}=-1$ But the value of $e^{x-y}$ cannot be negative; it is always greater than zero. This implies that $e^{x-y}>0$ Hence, the function $f(x,y)=\frac{xy}{1+e^{x-y}}$ is continuous on $R^{2}$.
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