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Question Number 102796 by saorey0202 last updated on 11/Jul/20

$$\mathrm{The}\mathrm{angle}\mathrm{between}\mathrm{the}\mathrm{vectors}$$$$2\mathbf{i}+3\mathbf{j}+\mathbf{k}\mathrm{and}2\mathbf{i}-\mathbf{j}-\mathbf{k}\mathrm{is}$$

Answered by bramlex last updated on 11/Jul/20

$$\cos \beta =\frac{\overrightarrow{a}.\overrightarrow{b}}{\mid \overrightarrow{a}\mid \mid \overrightarrow{b}\mid }=\frac{4-3-1}{\mid \overrightarrow{a}\mid \mid \overrightarrow{b}\mid }$$$$\beta ={90}^{\mathrm{o}}$$

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