acoth Mul acot x0 Add 0.500000000000000 x0 
Mul Add Mul Add 0.500000000000000 x0 Mul -1 Pow Add 1 Mul x0 x0 -1 acot x0 Pow Add 1 Mul -1 Mul Mul acot x0 Add 0.500000000000000 x0 Mul acot x0 Add 0.500000000000000 x0 -1 