Hello, sawawak!

I too can get only so far . . .

The limits are: .

I need to get: . for the answer.

The region looks like this:Code:| 1+ - - - - - * |:::::::::* : |:::::::* : |:::::* : |:::* : |:* : - * - - - - - + - - | 1

Reversing the order of integration, we have: .

And we have: .

. . . . . . . . . . . .

. . . . . . . . .

. . . . . . . . .

. . . . . . . . .

Now we must integrate: .

Did I make some egregious blunders?