Identify the substitution that transforms ∫1xx2−1dx\int \frac{1}{x \sqrt{x^2 - 1}} dx∫xx2−11dx into a simpler form.
u=x2−1u = x^2 - 1u=x2−1
x=sec(θ)x = \sec(\theta)x=sec(θ)
x=sin(θ)x = \sin(\theta)x=sin(θ)
u=xu = \sqrt{x}u=x