tan exp asin Add x0 -1.00009080398202 
Mul Pow sec exp asin Add x0 -1.00009080398202 2 Mul exp asin Add x0 -1.00009080398202 Pow sqrt Add 1 Mul -1 Mul Add x0 -1.00009080398202 Add x0 -1.00009080398202 -1 