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

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 a.`1/(sqrt(3))` b. `1/2` c. 1 d.`1/(sqrt(2))`

`(1)/(sqrt3)`

`(1)/(2)`

`1`

`(1)/(sqrt2)`

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