Use the half-angle formulas to simplify the expression. 
Definitions:
Right Hemisphere
The half of the brain that controls the left side of the body and is typically responsible for spatial abilities, facial recognition, and processing music and art.
Expression Of Emotion
The act of conveying feelings such as happiness, anger, or sadness through verbal and non-verbal means.
Recognition Of Patterns
The cognitive process involving identification and understanding of patterns and regularities in data.
Relay Station
A node or facility in a communication system where signals are received, amplified, processed, and then retransmitted to extend the range of signal transmission.
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