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