Let the volume of a parallelopiped whose coterminous edges are given by u = i + j +λ k, v = i + j +3 k and w =2 i + j + k be 1 cu. unit. If θ be the…

Let the volume of a parallelopiped whose coterminous edges are given by $$\begin{aligned} & \overrightarrow{\mathrm{u}}=\hat{i}+\hat{j}+\lambda \hat{k}, \overrightarrow{\mathrm{v}}=\hat{i}+\hat{j}+3 \hat{k} \text { and } \\ & \overrightarrow{\mathrm{w}}=2 \hat{i}+\hat{j}+\hat{k} \text { be } 1 \text { cu. unit. If } \theta \text { be the } \\ & \text { angle between the edges } \overrightarrow{\mathrm{u}} \text { and } \overrightarrow{\mathrm{w}}, \text { then } \\ & \cos \theta \text { can be : } \end{aligned} $$