Solve the differential equation using the method of variation of parameters. 
Definitions:
Magnetic Resonance Imaging
A non-invasive imaging technique that uses powerful magnetic fields and radio waves to generate detailed images of the organs and tissues in the body.
Positron Emission Tomography
A nuclear medicine functional imaging technique used to observe metabolic processes in the body as an aid to the diagnosis of disease.
Parasympathetic Division
A branch of the autonomic nervous system responsible for stimulating "rest-and-digest" or calming activities, reducing the body's stress response.
Autonomic Nervous System
The part of the nervous system that controls involuntary actions of the smooth muscles and heart and glands, regulating functions such as heart rate, digestion, respiratory rate, and pupillary response.
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