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A straight line with direction cosines $(0,1,0)$ is
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parallel to $y$ -axis
$\mathrm{D} \cdot \mathrm{C}^{\prime} \mathrm{s}(0,1,0)$
Since $x$ and $z$ are zero, the straight line is parallel to $\mathrm{y}-$ axis
Since $x$ and $z$ are zero, the straight line is parallel to $\mathrm{y}-$ axis
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