x
/ 3\
|(-1 + 4*x) |
|-----------|
| 3|
\ (3 + 4*x) /
$$\left(\frac{\left(4 x - 1\right)^{3}}{\left(4 x + 3\right)^{3}}\right)^{x}$$
((-1.0 + 4.0*x)/(3.0 + 4.0*x))^(3.0*x)
3*x
/ 1 4*x \
|- ------- + -------|
\ 3 + 4*x 3 + 4*x/
$$\left(\frac{4 x}{4 x + 3} - \frac{1}{4 x + 3}\right)^{3 x}$$
3*x
/ 1 \ 3*x
|-------| *(4*x - 1)
\4*x + 3/
$$\left(4 x - 1\right)^{3 x} \left(\frac{1}{4 x + 3}\right)^{3 x}$$