Question:
Find the angle between each of the following pairs of lines:
$\frac{\mathrm{x}-4}{4}=\frac{\mathrm{y}+1}{4}=\frac{\mathrm{z}-6}{5}$ and $\frac{\mathrm{x}-5}{1}=\frac{2 \mathrm{y}+5}{-2}=\frac{\mathrm{z}-3}{1}$
Solution:
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