Find the derivative of the function. 
Definitions:
Dorsal Spinothalamic Tract
A pathway in the spinal cord that transmits touch and proprioceptive information from the body to the thalamus in the brain.
Referred Pain
Pain that arises in one of the internal organs but is felt on the surface of the body.
Internal Organs
The group of organs located within the main cavities of the body, such as the heart, lungs, liver, and kidneys, essential for various bodily functions.
Rapidly Adapting Receptor
Body sensory receptor that responds briefly to the onset of a stimulus on the body.
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