The angle between the line $\overline{\mathrm{r}}=\left(2\overline{\mathrm{i}}-\overline{\mathrm{j}}+\overline{\mathrm{k}}\right)+\mathrm{\lambda }\left(\overline{\mathrm{i}}-\overline{\mathrm{j}}+\overline{\mathrm{k}}\right)$ and the plane $\overline{\mathrm{r}}.\left(3\overline{\mathrm{i}}+2\overline{\mathrm{j}}-\overline{\mathrm{k}}\right)=4$ is

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