1. The problem statement, all variables and given/known data (1 / x * sqrt(4x^2 - 1))dx 2. Relevant equations done by parts/trig? 3. The attempt at a solution 1 = c 2x = b sqrt(4x^2 - 1) = a sin(theta) = 2x sin(theta) / 2 = x -(1/2)*cos(theta) d(theta) = dx cos(theta) = -2*sqrt(4x^2 - 1) I am not sure what to do about the x? Can I just replace it all now?