acot Add -2 exp Pow sec x0 x0 
Mul -1 Mul Mul exp Pow sec x0 x0 Mul Pow sec x0 Add x0 -1 Add Mul x0 Mul tan x0 sec x0 Mul sec x0 log sec x0 Pow Add 1 Mul Add -2 exp Pow sec x0 x0 Add -2 exp Pow sec x0 x0 -1 