Find the derivative of the function by using the rules of differentiation. 
Definitions:
Nonpalpable Lymph Nodes
Lymph nodes that cannot be felt or detected through physical examination, often indicating they are not enlarged or swollen.
Pack-Years
A measure of smoking exposure, calculated by multiplying the number of packs of cigarettes smoked per day by the number of years the person has smoked.
Smoking History
A record of an individual's tobacco use, including duration and intensity, which is critical for assessing health risks.
Medical Record
A comprehensive document containing a patient's personal identification, medical history, treatment plans, and progress notes.
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