Filling in a function value The domain of f(x,y) =

Chapter 9, Problem 67AE

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QUESTION:

Filling in a function value The domain of \(f(x, y)=e^{-1 /\left(x^{2}+y^{2}\right)}\) excludes (0,0). How should f be defined at (0,0) to make it continuous there?

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QUESTION:

Filling in a function value The domain of \(f(x, y)=e^{-1 /\left(x^{2}+y^{2}\right)}\) excludes (0,0). How should f be defined at (0,0) to make it continuous there?

ANSWER:

Solution 67AE

Step 1  of  2:

Given function is f(x,y) =

Continuous  definition:

A function f is  said to be continuous at (a,b)  means  f is defined at (a , b) and  f(x,y) = f(a,b).

That is , the given function f  is continuous .

So , f(x,y) = f(0,0)

             f(x,y)  =

                                 

Path  x= 0 , then  f(x,y)  =

                                                     =

                                                     =

                                       

                                                     =

                                                     =  =  =  = 0

Therefore ,  f(x,y)  = = 0

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