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Q)

If the directions cosines of a line are $k,k,k$ then

\[(A)\;k\;>\;0\qquad(B)\;0\;<\;k\;<\;1\qquad(C)\;k\;=\;1\qquad(D)\;k\;=\;\frac{1}{\sqrt 3} or \frac{-1}{\sqrt 3}\]

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