If are vectors then show that Where is the angle between and are not coplanar.
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Originally Posted by usagi_killer If are vectors then show that Where is the angle between and are not coplanar. $\displaystyle \mathbf{a}\cdot \mathbf{b} = |\mathbf{a}||\mathbf{b}|\cos{\theta}$. Replace $\displaystyle \mathbf{b}$ with $\displaystyle \mathbf{b}\times \mathbf{c}$.
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