Use the half-angle formula to simplify the given expression.
Definitions:
Esophagus
The muscular tube that conveys food and liquids from the mouth to the stomach, playing a vital role in digestion.
Pulmonary Artery
The artery carrying deoxygenated blood from the right ventricle of the heart to the lungs for oxygenation.
Tympanic
Relating to the tympanum or eardrum, often used in the context of measuring body temperature via the ear canal.
Abnormally Low
Describing a condition or value that is much less than the normal or expected level.
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