Find the total differential of the function. 
Definitions:
Preoperational
A stage in Jean Piaget’s theory of cognitive development where children from about 2 to 7 years old engage in symbolic play but lack operations (logical rules) for consistent reasoning.
Concrete Operational
A stage in Piaget's theory of cognitive development where children (ages 7-11) can think logically about concrete events.
Formal-Operational
Formal-operational stage is a phase in Piaget's theory of cognitive development when individuals gain the ability to think abstractly, logically, and systematically.
Intuitive Stage
A stage in Piaget's theory of cognitive development, occurring roughly between the ages of 4 and 7, where children start using intuition and perception but lack logical reasoning.
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