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Mul Pow tan Pow sqrt log sec E Add sech x0 4 Add Add 2 x0 -1 Add Mul Add 2 x0 Mul Pow sec Pow sqrt log sec E Add sech x0 4 2 Mul Pow sqrt log sec E Add Add sech x0 4 -1 Mul Mul sqrt log sec E log sqrt log sec E Mul tanh x0 Mul -1 sech x0 Mul tan Pow sqrt log sec E Add sech x0 4 log tan Pow sqrt log sec E Add sech x0 4 