2 sech (5*x)
sech(5*x)^2
2 -10*sech (5*x)*tanh(5*x)
2 / 2 \ 50*sech (5*x)*\-1 + 3*tanh (5*x)/
2 / 2 \ -1000*sech (5*x)*\-2 + 3*tanh (5*x)/*tanh(5*x)