1 ------- tanh(x)
2 -1 + tanh (x) ------------- 2 tanh (x)
/ 2 \ / 2 \ | -1 + tanh (x)| 2*\-1 + tanh (x)/*|-1 + -------------| | 2 | \ tanh (x) / -------------------------------------- tanh(x)
/ 2 3\ | / 2 \ / 2 \ | | 2 5*\-1 + tanh (x)/ 3*\-1 + tanh (x)/ | 2*|-2 + 2*tanh (x) - ------------------ + ------------------| | 2 4 | \ tanh (x) tanh (x) /