tan Mul Pow csc Add x0 sec x3 -2 x0 
Mul Pow sec Mul Pow csc Add x0 sec x3 -2 x0 2 Add Mul x0 Mul Pow csc Add x0 sec x3 3 Mul -2 Mul Mul -1 cot Add x0 sec x3 csc Add x0 sec x3 Pow csc Add x0 sec x3 -2 