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Linear Algebra

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Unit Vector: Identify Unit Vectors in Three Coordinates

LINALG-E1V73I

Which of the following vectors are unit vectors?

Select ALL that apply.

A

$\begin{bmatrix} 1/2\\\ 0\\\ -1/2\end{bmatrix}$

B

$\begin{bmatrix} -2\\\ 4\\\ -1\end{bmatrix}$

C

$\begin{bmatrix} \sqrt{2/3}\\\ 0\\\ 1/\sqrt{3}\end{bmatrix}$

D

$\begin{bmatrix} \sqrt{3}/4\\\ 1/4\\\ \sqrt{3}/2\end{bmatrix}$

E

$\begin{bmatrix} 1\\\ -1\\\ 0\end{bmatrix}$

F

$\begin{bmatrix} 2/3\\\ 1/3\\\ -2/3\end{bmatrix}$