Find the indicated integrals.

(a) $\displaystyle \int \frac{\ln(x^3)}{x}\,dx$ = $+ C$

(b) $\displaystyle \int\frac{e^t\cos(e^t)}{4 + 4 \sin(e^t)}\, dt$ = $+ C$

(c) $\displaystyle \int_0^{3/4}\frac{\sin^{-1}\left(\frac{4}{3}x\right)}{\sqrt{9 - 16 x^2}}\, dx$ =