Changing evaluation of an axis on a triple integral

In summary, the conversation discusses the approach to changing the direction of evaluation for a double/triple integral when the bounds are complicated and cannot be easily drawn on a graph. The use of optimization in several variables is not necessary, and pictures can be helpful in understanding the equations. It is suggested to analyze the equations for each direction and pick off the graph for a better understanding.
  • #1
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So I'm in the middle of a calculus 3 course, and one thing I've been lightly chewing on is how to change the direction of evaluation of a double/triple integral when the bounds are complicated enough that they can't be drawn easily on a graph. Would you have to use the optimization in several variables equation, fxx(a,b)fyy(a,b)-fxy(a,b)^2?
 
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  • #2
No. I don't see that optimization has anything to do with your question. Pictures are always a very good idea. Sometimes you can do it by just studying the equations. For example if you want your inner integral to be in the x direction your limits would go from x-on-the-back to x-on-the-front (assuming the usual orientation of xyz axes. If you set the equation for x-on-the-back equal to x-on-the-front you will have a yz equation to analyze for your next limits. And of course you need to be able to write the yz equations for x-on-the-back and x-on-the-front. Similarly for the other directions first. But you can't beat picking it off the graph.
 

1. How does changing the evaluation of an axis affect the result of a triple integral?

Changing the evaluation of an axis in a triple integral can significantly impact the final result. This is because the bounds of integration for each axis determine the volume of the region being integrated over. Therefore, changing the bounds on one axis will alter the volume and ultimately the result of the integral.

2. Can changing the evaluation of an axis in a triple integral change the type of integral being solved?

Yes, changing the evaluation of an axis can change the type of integral being solved. For example, if the original integral was in Cartesian coordinates and the new evaluation changes it to cylindrical coordinates, the type of integral will change from a triple integral to a double integral.

3. How do you determine the new bounds of integration when changing the evaluation of an axis?

The new bounds of integration can be determined by translating the original bounds from one coordinate system to the other. This involves using the appropriate transformation equations for the coordinate systems involved. It is important to pay attention to any restrictions or conditions on the new bounds to ensure accurate evaluation.

4. Can changing the evaluation of an axis make a triple integral easier to solve?

Yes, changing the evaluation of an axis can sometimes make a triple integral easier to solve. This is because certain coordinate systems may have simpler transformation equations or may better suit the shape of the region being integrated over. However, this is not always the case and it is important to carefully consider the new bounds and the complexity of the integral before making a change.

5. Are there any limitations to changing the evaluation of an axis in a triple integral?

There may be limitations to changing the evaluation of an axis in a triple integral. For example, certain coordinate systems may not be suitable for certain regions or may result in more complex bounds. Additionally, it is important to ensure that the new bounds still accurately represent the region being integrated over. It is always best to carefully consider the limitations before making any changes to the evaluation of an axis in a triple integral.

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