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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=1a n dx+3y+2z=2.` If `L` makes an angle `alpha` with the positive x-axis, then `cosalpha` equals a. `1/2` b. `1` c. `1/(sqrt(2))` d. `1/(sqrt(3))`

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