\( \mathrm{P} \) Find the acute angle between the following planes:...

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\( \mathrm{P} \)
Find the acute angle between the following planes:
W
\[
\vec{r} \cdot(2 \hat{i}-3 \hat{j}+4 \hat{k})=1 \text { and } \vec{r} \cdot(-\hat{i}+\hat{j})=4
\]
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