Math Problem Statement
Soient les vecteurs u=(1,-1,1) et v=(2,2,0) et w=(3,0,0). Alors le cosinus de l’angle entre les vecteur (u x v) et (u x w) est:
Solution
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Math Problem Analysis
Mathematical Concepts
Vector Calculus
Cross Product
Dot Product
Norm of a Vector
Cosine of Angle Between Vectors
Formulas
Cross product: u × v = |i j k| = (u2v3 - u3v2, u3v1 - u1v3, u1v2 - u2v1)
Dot product: u · v = u1v1 + u2v2 + u3v3
Cosine of the angle between vectors: cos(θ) = (u · v) / (||u|| ||v||)
Norm of a vector: ||u|| = sqrt(u1^2 + u2^2 + u3^2)
Theorems
Cosine Theorem for Vectors
Suitable Grade Level
Grades 11-12
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