3-d

Question: The direction cosines of the line $x=y=z$ are



1) $\frac{1}{\sqrt{3}},\frac{1}{\sqrt{3}},\frac{1}{\sqrt{3}}$
2) $\frac{1}{3},\frac{1}{3},\frac{1}{3}$
3) 1, 1, 1
4) None of these
Solution: Explanation: No Explanation
System of co-ordinates Direction cosines and direction ratios Projection

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