math: fix latex error
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@ -328,7 +328,7 @@ Vectors with the same magnitude but opposite directions are equal to one another
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### Unit vector
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The **unit vector** of a vector is a vector of the same direction as the original with a magnitude of $1$. It is denoted via a caret/hat.
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$\hat{v}$$
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$$\hat{v}$$
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From the original vector $\vec{u}$, the unit vector $\hat{u}$ can be found by dividing by the magnitude of the vector.
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$$\hat{u}=\frac{\vec{u}}{|\vec{u}|}$$
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