Math Problem Statement
解释一下为什么cosβ是这样算的
Solution
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Math Problem Analysis
Mathematical Concepts
Vectors
Dot Product
Trigonometry
Formulas
cosβ = (P1P2·n) / (|P1P2| |n|)
P1P2 = (r2 - r1, -z1)
n = (0, 1)
Theorems
Dot product theorem
Suitable Grade Level
Undergraduate Mathematics or Physics
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