2/x\
tanh |-|
1 \2/
- - --------
2 2
$$- \frac{1}{2} \tanh^{2}{\left (\frac{x}{2} \right )} + \frac{1}{2}$$
/ 2/x\\ /x\
|-1 + tanh |-||*tanh|-|
\ \2// \2/
-----------------------
2
$$\frac{1}{2} \left(\tanh^{2}{\left (\frac{x}{2} \right )} - 1\right) \tanh{\left (\frac{x}{2} \right )}$$
/ 2/x\\ / 2/x\\
-|-1 + tanh |-||*|-1 + 3*tanh |-||
\ \2// \ \2//
-----------------------------------
4
$$- \frac{1}{4} \left(\tanh^{2}{\left (\frac{x}{2} \right )} - 1\right) \left(3 \tanh^{2}{\left (\frac{x}{2} \right )} - 1\right)$$