Let L be the line of intersection of the planes \[2x+3y+z=1\] and\[x+3y+2z=2\]. If L makes an angle \[\alpha \] with the positive x-axis, then \[cos\text{ }\alpha \]equals

Let L be the line of intersection of the planes \[2x+3y+z=1\] and\[x

1.	Let L be the line of intersection of the planes \[2x+3y+z=1\] and\[x+3y+2z=2\]. If L makes an angle \[\alpha \] with the positive x-axis, then \[cos\text{ }\alpha \]equals
A.	1
B.	\[\frac{1}{\sqrt{2}}\]
C.	\[\frac{1}{\sqrt{3}}\]
D.	\[\frac{1}{2}\]
Answer» D. \[\frac{1}{2}\]

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Let L be the line of intersection of the planes \[2x+3y+z=1\] and\[x+3y+2z=2\]. If L makes an angle \[\alpha \] with the positive x-axis, then \[cos\text{ }\alpha \]equals

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