1.

If the direction cosines of a line are \[\left( \frac{1}{c},\frac{1}{c},\frac{1}{c} \right)\],  then  [JET 1989; CET 1993]

A. \[c>0\]
B. \[c=\pm \sqrt{3}\]
C. \[0<c<1\]
D. \[c>2\]
Answer» C. \[0<c<1\]


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