Find the limist if it exists for a 3-variable function

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In summary, a limit for a 3-variable function is the value that the function approaches as the three variables approach a specific point. It exists if the values of the function approach a single finite number, and can be determined through various methods. It can also be undefined if the values approach different finite numbers depending on the direction. Limits for 3-variable functions have practical applications in real-world situations and there are special cases for finding them, such as indeterminate forms that may require additional techniques for evaluation.
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zhuyilun
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Homework Statement


lim(e^(-x*y) * sin( pi * z/2) as (x,y,z) approaches (3,0,1)

Homework Equations





The Attempt at a Solution


i know how to find the limit exists or not for a 2-variable function which is just set x=o;y=0;x=y
how can this method applies here
 
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  • #2
Remember that the first approach when computing any limit is to just substitute the point that you are approaching.
 
  • #3
n!kofeyn said:
Remember that the first approach when computing any limit is to just substitute the point that you are approaching.

And think about whether the function is continuous there, right?
 

1. What is a limit for a 3-variable function?

A limit for a 3-variable function is a mathematical concept that represents the value that a function approaches as the three variables approach a specific point.

2. How do you determine if a limit exists for a 3-variable function?

A limit for a 3-variable function exists if the values of the function approach a single finite number as the three variables approach a specific point. This can be determined through various methods, such as graphing, algebraic manipulation, or using limit laws.

3. Can a limit for a 3-variable function be undefined?

Yes, a limit for a 3-variable function can be undefined if the values of the function approach different finite numbers depending on the direction in which the three variables approach the specific point. In this case, the limit does not exist.

4. How can limits for 3-variable functions be used in real-world applications?

Limits for 3-variable functions can be used to model real-world situations where multiple variables are involved, such as in physics, economics, or engineering. They can help predict the behavior of a system as the variables change and approach certain values.

5. Are there any special cases for finding limits of 3-variable functions?

Yes, there are special cases for finding limits of 3-variable functions, such as indeterminate forms, where the limit cannot be determined by simply plugging in values. In these cases, additional techniques, such as L'Hospital's rule or trigonometric identities, may be used to evaluate the limit.

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