Hello, arbolis!

.

Let: .

. . Then: .

Substitute: .

. . . . . . . .

Back-substitute: .

. . and we have: .

Now we evaluate from 0 to

When we substitute , we get 0.

We don't substitute . we have tosneak upon it.

We substitute , then take limit as gets infinite.

We have: .

. . The first limit is: .

. . The second limit is: .

. . Divide top and bottom by .

Therefore, we have: .

Am I close?