# Thread: Double integral question (inc. changing the order of integration)

1. ## Double integral question (inc. changing the order of integration)

It's not actually the double integration part I'm having trouble with. The question is:

I managed to get it down to this:

but I'm not sure how to take it any further. I'm not even sure that is correct. I tried some substitutions and integrating by parts but didn't get anywhere (apparently) useful. Could anyone help?

2. Hello, but is that first you have to integrate with respect to y, this integral is the inverse of sin, evaluate and then integrate with respect to x.

Greetings

3. Because the question asked to sketch the region and change the order, I did that first so that you have to integrate with respect to x first. I did that, and ended up with the expression seen in the 2nd picture I posted and can't take that any further haha

I think substitution seems like a sensible step forward, but like I said I couldn't get it to work