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[" 51.Let "L" be the line of intersectio...

[" 51.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 "cos alpha" equals "],[[" (a) "1," (b) "(1)/(sqrt(2))],[" (c) "(1)/(sqrt(3))," (d) "(1)/(2)]]

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