3. Consider a class Expression used to store algebraic expressions, which have double values for left- and right- hand sides as well as a character for the symbol between them. Create two classes inheriting from Expression, Equality to represent equalities (mathematical expressions with an-sign) and LessThan to represent less than inequalities (mathematical expressions with a using namespace std; class Expression protected: double LHS, RHS; char symbol; public: double getLHS ); double getRHS); char getSymbol(); double Expression: :getLHS ) f return LHS ;) double Expression: :getRHS ) f return RHS ;) char Expression: :getSymbol) f return symbol; ) ostream& operator(ost rean& LHS, Expression RHS) { return LHS