1
-----------------
/ 2\
| (y + 1) |
13*|1 + --------|
\ 169 /
$$\frac{1}{\frac{1}{13} \left(y + 1\right)^{2} + 13}$$
-2*(1 + y)
--------------------
2
/ 2\
| (1 + y) |
2197*|1 + --------|
\ 169 /
$$- \frac{2 y + 2}{2197 \left(\frac{1}{169} \left(y + 1\right)^{2} + 1\right)^{2}}$$
/ 2 \
| 4*(1 + y) |
26*|-1 + --------------|
| 2|
\ 169 + (1 + y) /
------------------------
2
/ 2\
\169 + (1 + y) /
$$\frac{\frac{104 \left(y + 1\right)^{2}}{\left(y + 1\right)^{2} + 169} - 26}{\left(\left(y + 1\right)^{2} + 169\right)^{2}}$$