Vector Algebra

Let $\mathbf{O A}=\hat{\mathbf{i}}+2 \hat{\mathbf{j}}-2 \hat{\mathbf{k}}$ and $\mathbf{O B}=-2 \hat{\mathbf{i}}-3 \hat{\mathbf{j}}+6 \hat{\mathbf{k}}$ be the position vectors of two points $A$ and $B$. If $C$ is a point on the bisector $\angle A O B$ and $O C=\sqrt{42}$, then $\mathbf{O C}=$