Evaluate the indefinite integral:

⌠

⌡ [√(16 x^2 − 144) / x] dx

Sorry for the lame text, but it's all I could gather, I've gotten to the point:

12 ⌠

⌡ [cos (t) / cos^3 (t) sin (t)] dt

by setting x = 3 tan (t); dx = 3 sec^2 (t); and √(x^2 + 9) = 3 sec (t), but I don't know how to solve it from here. Please help!