Math Problem Statement
由题目可得,a·cosB+b·cosA=2c·cosA。根据余弦定理得到,cosB=(a^2+c^2-b^2)/2ac,cosA=(b^2+c^2-a^2)/2bc,代入化简得到: bc=b^2+c^2-a^2。我这么做对吗?
Solution
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Math Problem Analysis
Mathematical Concepts
Trigonometry
Cosine Rule
Vector Dot Product
Formulas
Cosine rule
Vector dot product formula
Theorems
Properties of triangles
Suitable Grade Level
Advanced High School
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