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Questions  >>  JEEMAIN and NEET  >>  Mathematics  >>  Class11  >>  3-D Geometry
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$L$ is line of intersection of the planes $2x+3y+z=1\:\:and\:\:x+3y+2z=2$ and $\alpha$ is the angle made by the line $L$ with positive $x-axis$ then $cos\alpha=?$

$\begin{array}{1 1} (a)\:\:\large\frac{1}{2}\:\:\:\qquad\:\:(b)\:\:1\:\:\:\qquad\:\:(c)\:\:\frac{1}{\sqrt 2}\:\:\qquad\:\:(d)\frac{1}{\sqrt 3}. \end{array} $</p

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