/ 2 \
| / 6\ / 7 \|
| 5 \-4 + 7*x / *\38 + x - 4*x/|
2*|21*x - ----------------------------|
| 2 |
| / 7 \ |
\ 1 + \38 + x - 4*x/ /
----------------------------------------
2
/ 7 \
1 + \38 + x - 4*x/
$$\frac{2 \left(21 x^{5} - \frac{\left(7 x^{6} - 4\right)^{2} \left(x^{7} - 4 x + 38\right)}{\left(x^{7} - 4 x + 38\right)^{2} + 1}\right)}{\left(x^{7} - 4 x + 38\right)^{2} + 1}$$
/ 3 3 2 \
| / 6\ / 6\ / 7 \ 5 / 6\ / 7 \|
| 4 \-4 + 7*x / 4*\-4 + 7*x / *\38 + x - 4*x/ 126*x *\-4 + 7*x /*\38 + x - 4*x/|
2*|105*x - -------------------- + ------------------------------- - ----------------------------------|
| 2 2 2 |
| / 7 \ / 2\ / 7 \ |
| 1 + \38 + x - 4*x/ | / 7 \ | 1 + \38 + x - 4*x/ |
\ \1 + \38 + x - 4*x/ / /
--------------------------------------------------------------------------------------------------------
2
/ 7 \
1 + \38 + x - 4*x/
$$\frac{2 \left(- \frac{126 x^{5} \left(7 x^{6} - 4\right) \left(x^{7} - 4 x + 38\right)}{\left(x^{7} - 4 x + 38\right)^{2} + 1} + 105 x^{4} - \frac{\left(7 x^{6} - 4\right)^{3}}{\left(x^{7} - 4 x + 38\right)^{2} + 1} + \frac{4 \left(7 x^{6} - 4\right)^{3} \left(x^{7} - 4 x + 38\right)^{2}}{\left(\left(x^{7} - 4 x + 38\right)^{2} + 1\right)^{2}}\right)}{\left(x^{7} - 4 x + 38\right)^{2} + 1}$$