Unit vector in terms of direction cosines for JEE

Formula

\(\hat{a}=l\hat{i}+m\hat{j}+n\hat{k}\)

Variables: \(l,m,n\) are the direction cosines of \(\vec{a}\).

Conditions: \(l^2+m^2+n^2=1\).

Constructing a unit vector from directional information.