Hello, currently I have math homework like this: let's change the integral order (like the image). I do not know the syntax to do this how.
Are you using Wolfram|Alpha? Please see the examples section for example of how to do Integrals
First, you will want to rewrite this so that the dx and the dy are both at the right side of the equation. Currently the dx is to the left of an integral. If you aren't sure how to do this, I would ask your math teacher.
http://www.wolframalpha.com/examples/Integrals.html
Yes, I'm using Wolfram|Alpha, I have a question is why the dx is to the left of an integral?
$\int f(x)\,dx$ is the most common way to write out an integral. but nothing is stopping you from writing $\int dx f(x)$
You should talk to your teacher about this. This is a good question about calculus notation.
Oh, yes, thank a lot Sean Clarke for supporting me and I'll ask my teach about this notation.