The direction cosines of the vector $(2\hat i+2\hat j-\hat k)$ are ___________.

Question

$\begin{array}{1 1} (A)\;\bigg(\large\frac{2}{3},\frac{-2}{3},\frac{-1}{3}\bigg) \\ (B)\;\bigg(\large\frac{2}{3},\frac{2}{3},\frac{1}{3}\bigg) \\(C)\;\bigg(\large\frac{2}{3},\frac{2}{3},\frac{-1}{3}\bigg) \\(D)\;\bigg(\large\frac{2}{5},\frac{2}{5},\frac{-1}{5}\bigg) \end{array} $