Find the angle between the planes r (i+j+k)=5 and r (i-j+k)=6. - Vidyadip

Question

Find the angle between the planes $\vec{r} \cdot(\hat{i}+\hat{j}+\hat{k})=5$ and $\vec{r} \cdot(\hat{i}-\hat{j}+\hat{k})=6$.

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Answer

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