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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 angles ` alpha `with the positive x-axis, then cos` alpha ` equals `1/(sqrt(3))` `1/2` 1 `1/(sqrt(2))`

A

`(1)/(2)`

B

1

C

`(1)/(sqrt(2))`

D

`(1)/(sqrt(3))`

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D
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