(a) The lines l1(t) = t(1,−1, 5) + (2, 0,−4) and l2(t) = t(1,−1, 5) + (1, 3,−5) are parallel. Explain why the method of Example 9 cannot be used to calculate the distance between the lines.
(b) Find another way to calculate the distance. (Hint: Try using some calculus.)
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