P Find the angle between the line \( \vec{r}=(\hat{i}+2 \hat{j}-\ha...

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P Find the angle between the line \( \vec{r}=(\hat{i}+2 \hat{j}-\hat{k})+\lambda(\hat{i}-\hat{j}+\hat{k}) \) and the

W plane \( \vec{r} \cdot(2 \hat{i}-\hat{j}+\hat{k})=4 \)
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