Let L be the line of intersection of the...

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,` whith the positive x-axis, then `cos alpha ` equals

A

`(1)/(sqrt3)`

B

`1/2`

C

`1`

D

`(1)/(sqrt2)`

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The correct Answer is:

A

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