Chapter 6.10, Problem 42E

Two ways Evaluate the following integrals two ways.

1. a. Simplify the integrand first and then integrate.
2. b. Change variables (let u = ln x), integrate, and then simplify your answer. Verify that both methods give the same answer.

42. ${\displaystyle {\int }_1^{\sqrt{3}}\frac{\text{sech}(\ln x)}{x}dx}$