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 pos

### Question Asked by a Student from EXXAMM.com Team

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
A

1/sqrt3

B

1/2

C

1

D

1/sqrt2

#### HINT

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

(Provided By a Student and Checked/Corrected by EXXAMM.com Team)

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