The expression cos(θ/2) represents the cosine of half an angle, which is a critical concept in trigonometry associated with half-angle identities. This term allows for the simplification of expressions involving angles by providing a way to express the cosine of half an angle in terms of the cosine of the original angle. Understanding cos(θ/2) is essential for solving various trigonometric equations and is useful in real-world applications involving periodic phenomena.
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