DLMF:1.6.E4 (Q175)

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DLMF:1.6.E4
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    cos θ = 𝐚 𝐛 𝐚 𝐛 ; 𝜃 𝐚 𝐛 norm 𝐚 norm 𝐛 {\displaystyle{\displaystyle\cos\theta=\frac{\mathbf{a}\cdot\mathbf{b}}{\|% \mathbf{a}\|\;\|\mathbf{b}\|};}}
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