Find the derivative 
Definitions:
Panic Disorder
A psychiatric disorder characterized by unexpected and repeated episodes of intense fear accompanied by physical symptoms such as chest pain, heart palpitations, or dizziness.
Agoraphobia
Refers to the fear of being in situations where escape might be difficult or that help wouldn't be available if things go wrong.
Behavioral Treatments
Therapeutic interventions designed to modify harmful or undesired behaviors using principles of learning, such as reinforcement and punishment.
Underlying Symptoms
Fundamental symptoms that may not be immediately apparent but contribute to the manifestation of a clinical condition.
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