Pow sech atan sec x0 x0 
Mul Pow sech atan sec x0 Add x0 -1 Add Mul x0 Mul Mul tanh atan sec x0 Mul -1 sech atan sec x0 Mul Mul tan x0 sec x0 Pow Add 1 Mul sec x0 sec x0 -1 Mul sech atan sec x0 log sech atan sec x0 