I was previously using this as a method to solve them but I ran into a few instances of having different answers than the book. I'll look further into it, thank you for the response.
Homework Statement
I'm given the problem: \int\frac{\sqrt{y^{2}-25}}{y} dy
Homework Equations
I set y = 5sec(u), and solve for the subsitution.
The Attempt at a Solution
At the culmination of my solution, I achieve: 5tan(u) - 5u + C
Here is my dilemma, u stands for...