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** Q 1125223161. ** 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 cosalpha equals

**JEE 2007 **

#### HINT

Let the direction cosines of the line of intersection be ` l,m,n` .
`=>2l+3m+n=0` and
`l+3m+2n=0`