Mul sec Mul -0.995054753686730 x0 sec Add tan x0 acot x0 
Add Mul sec Add tan x0 acot x0 Mul Mul tan Mul -0.995054753686730 x0 sec Mul -0.995054753686730 x0 -0.995054753686730 Mul sec Mul -0.995054753686730 x0 Mul Mul tan Add tan x0 acot x0 sec Add tan x0 acot x0 Add Pow sec x0 2 Mul -1 Pow Add 1 Mul x0 x0 -1 