Gilbert Strang, Calculus, 3rd edition (Wellesley-Cambridge Press; MIT OpenCourseWare RES.18-001) §11.1 Vectors and Dot Products, #44 · Multivariable Calculus · Vectors & geometry

If … choose … so that … and

If $V = i + 2 k$ choose $W$ so that $V \cdot W = ∣ V ∣∣ W ∣$ and $∣ V + W ∣ = ∣ V ∣ + ∣ W ∣$ .

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Gilbert Strang, Calculus, 3rd edition (Wellesley-Cambridge Press; MIT OpenCourseWare RES.18-001) · §11.1 Vectors and Dot Products, #44

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