Mul Add x0 x2 tanh sec sec atan x0 
Add tanh sec sec atan x0 Mul Add x0 x2 Mul Pow sech sec sec atan x0 2 Mul Mul tan sec atan x0 sec sec atan x0 Mul Mul tan atan x0 sec atan x0 Pow Add 1 Mul x0 x0 -1 