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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` with the positive X=axis, then `cosalpha` equals

A

`1//sqrt(3)`

B

`1//2`

C

1

D

`1//sqrt(2)`

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The correct Answer is:
A
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