Производная (2-tanh(x)^2)

Вы ввели

        2   
2 - tanh (x)

$$- \tanh^{2}{\left (x \right )} + 2$$

Первая производная

 /          2   \        
-\2 - 2*tanh (x)/*tanh(x)

$$- \left(- 2 \tanh^{2}{\left (x \right )} + 2\right) \tanh{\left (x \right )}$$

Вторая производная

   /         2   \ /           2   \
-2*\-1 + tanh (x)/*\-1 + 3*tanh (x)/

$$- 2 \left(\tanh^{2}{\left (x \right )} - 1\right) \left(3 \tanh^{2}{\left (x \right )} - 1\right)$$

Третья производная

  /         2   \ /           2   \        
8*\-1 + tanh (x)/*\-2 + 3*tanh (x)/*tanh(x)

$$8 \left(\tanh^{2}{\left (x \right )} - 1\right) \left(3 \tanh^{2}{\left (x \right )} - 2\right) \tanh{\left (x \right )}$$