Indefinite Integration

$\frac{1}{3} \sec ^2 \sqrt{9 x^2-12 x+1+C}$

$\frac{1}{3} \sec ^2 x+C$

$\frac{1}{2} \log \left|\sec \sqrt{9 x^2-12 x+1}\right|+C$

$\frac{1}{3} \log \left|\sec \sqrt{9 x^2-12 x+1}\right|+C$