Find the differential of the function. 
Definitions:
Piaget
A Swiss developmental psychologist and philosopher known for his pioneering work in child development and his theory of cognitive development in children.
Symbolic Thinking
The ability to use symbols, signs, or objects to represent ideas or concepts, significant in language development and creative thinking.
Cognitive Developmental Milestones
Refer to the key stages in early childhood and adolescence where individuals achieve new abilities in language, thought, problem-solving, and personal interaction.
Piaget
Piaget, Jean Piaget, was a Swiss psychologist best known for his pioneering work in child development, specifically his theory of cognitive development that describes how children's intellect grows and evolves in stages.
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