Evaluate without using a calculator. Answer in radians. 
Definitions:
Knowledgeable
Being well-informed, educated, or competent in a particular area or subject.
Phenomenon
A fact, occurrence, or circumstance observed or observable, often remarkable or impressive in nature.
Process
Denotes a series of actions or steps taken to achieve a particular end.
Referent
In leadership and influence, a referent power base that relies on followers' identification and liking towards the leader.
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