Math Problem Statement
tứ diện ABCD có AB=AC=AD và góc BAC=góc BAD=60 độ. HÃy xác định góc giữa các cặp vecto AB và CD
Solution
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Math Problem Analysis
Mathematical Concepts
Geometry
Vectors
Symmetry
Formulas
Dot product formula
Cosine rule for vectors
Theorems
Properties of symmetrical figures in space
Suitable Grade Level
Advanced High School