Find all the second partial derivatives. 
Definitions:
Trust Versus Mistrust
A stage in Erik Erikson's theory of psychosocial development where an infant learns to trust or mistrust their caregivers and environment.
Industry Versus Inferiority
A stage in Erikson's psychosocial development theory where children, typically between ages 6 and 11, develop a sense of competence by mastering skills.
Autonomy Versus Shame
A stage in Erikson's theory of psychosocial development where young children learn to be self-sufficient or experience doubt in their abilities.
Identity Foreclosure
Marcia’s term for the status of individuals who have made a commitment but have not experienced a crisis.
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