i.3.1.35 Indefinite integrals

condition: Find the indefinite integrals: a) \( \int \frac{7 x+2}{\sqrt{-x^{2}-3 x-1}} d x \) b) \( \int \frac{\cos 2 x}{\cos 4 x-3 \sin 2 x} d x \), c) \( \int \sqrt{x+1} \ln x d x \)