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Vector Equation for Straight Line

Does a line h...

Question

Does a line have both direction ratios and direction cosines??

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Solution

Solution -: Let me explain this ,
Aline can have two sets of dc's according to its direction. The direction cosines of two parallel lines are always the same. Direction ratios are proportional to direction cosines and hence for a given line, there can be infinitely many direction ratios.It means it is true.

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