int degree(const ex & s) const;
int ldegree(const ex & s) const;
ex coeff(const ex & s, int n = 1) const;
bool has(const ex & other, unsigned options = 0) const;
ex eval(int level=0) const;
ex evalf(int level=0) const;
int degree(const ex & s) const;
int ldegree(const ex & s) const;
ex coeff(const ex & s, int n = 1) const;
bool has(const ex & other, unsigned options = 0) const;
ex eval(int level=0) const;
ex evalf(int level=0) const;