Mathematics

Problem

For a non-zero vector

\mathbf{a}

, which expression gives the vector having the same direction as

\mathbf{a}

but unit magnitude? a)

\dfrac{\mathbf a}{|\mathbf a|^{2}}

|\mathbf a|\,\mathbf a

\dfrac{\mathbf a}{|\mathbf a|}

\dfrac{\mathbf a}{\sqrt{|\mathbf a|}}