Question
What are the d.c's of the line whose d.r's are 1. -2.
and 3?Solution
ATQ,
We are given the direction ratios (d.r's) of a line as = 1,−2,3 To find the direction cosines (d.c's), use the formula: 
Where a=1, b=−2, c=3
Compute magnitude:
Then, thedirection cosines will be:
So the d.c's are: Therefore, option 4 is correct answer
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