Use the half-angle formula to simplify the given expression. 
Definitions:
Diagnosis
The process of identifying a disease, condition, or problem by its symptoms and from an analysis of the underlying physical or mental causes.
Greek Words
Words originating from the Greek language, often used in scientific, technical, and philosophical contexts.
Job Redesign
The process of altering a job to make it more engaging and satisfying for the employee by changing tasks, duties, or responsibilities.
Job Rotation
A work practice where employees are moved between different jobs or tasks at regular intervals to increase versatility and reduce monotony.
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