law of cosines
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⟩ ⟩ ⟩ ⟩ 餘弦定理
u⋅v=∥u∥∥v∥cosθ\mathbf{u}\cdot\mathbf{v}=\|\mathbf{u}\|\|\mathbf{v}\|\cos\thetau⋅v=∥u∥∥v∥cosθ
LaTeX ⟩ vector
Mathematics for 3D Game Programming & Computer Graphics (2nd Edition, 2004)