Math Problem Statement
Tính cos 2 π phần 3.
Solution
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Math Problem Analysis
Mathematical Concepts
Trigonometry
Unit Circle
Cosine Function
Formulas
cos(θ) = -cos(π - θ)
cos(π/3) = 1/2
Theorems
Unit Circle Theorem
Cosine of Supplementary Angles
Suitable Grade Level
Grades 9-11