Math Problem Statement
不需要考虑外接圆的半径,直接用余弦定理就能约分了啊
Solution
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Math Problem Analysis
Mathematical Concepts
Trigonometry
Cosine Rule
Vector Dot Product
Triangle Geometry
Formulas
Cosine Rule: c^2 = a^2 + b^2 - 2ab * cos(C)
Theorems
Angle sum property of a triangle
Suitable Grade Level
Advanced High School