Find the orthogonal trajectories of the family of curves. 
Definitions:
Stress-Moderating Hormone
A hormone that helps regulate the body’s response to stress, such as cortisol, which plays a role in the body’s "fight or flight" response.
Optimistic
Having a positive, hopeful outlook on future events, believing in the likelihood of favorable outcomes.
External Locus of Control
The belief that outcomes in one's life are determined by external forces or factors beyond one's personal control.
Healthy Aging
The process of developing and maintaining functional ability that enables wellbeing in older age.
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