JEE Math Practice Question
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.$${1 \over {\sqrt 2 }}$$
- C.$${1 \over {\sqrt 3 }}$$
- D.$${1 \over 2}$$
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