Question:
Find the angle between each of the following pairs of lines:
$\overrightarrow{\mathrm{r}}=(3 \hat{\mathrm{i}}-4 \hat{\mathrm{j}}+2 \hat{\mathrm{k}})+\lambda(\hat{\mathrm{i}}+3 \hat{\mathrm{k}})$ and $\overrightarrow{\mathrm{r}}=5 \hat{\mathrm{i}}+\mu(-\hat{\mathrm{i}}+\hat{\mathrm{j}}+\hat{\mathrm{k}})$
Solution:
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