Find the arc length of the curve 
from x = 1 to x = 3.
Definitions:
Retinohypothalamic Tract
Neural route formed by axons of photosensitive retinal ganglion cells (pRGCs) from the retina to the suprachiasmatic nucleus; allows light to entrain the SCN’s rhythmic activity.
Benzodiazepines
A class of psychoactive drugs known for their tranquilizing effects, often used to treat anxiety, insomnia, and certain forms of epilepsy.
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