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Find the direction cosines of the line through (-2, 4, -5) and (1, 2, 3).
A3/√77, -2/√77, 8/√77
B3/77, -2/77, 8/77
C-3/√77, -2/√77, 8/√77
D3/√77, 2/√77, 8/√77
Answer & Solution
Correct answer: A. 3/√77, -2/√77, 8/√77
The differences are 3, -2, 8 and the length is the root of 9 + 4 + 64, which is √77.
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