Q 1441880723.     Find the angle between the line `vec{r}= vec{i}+ vec{j}+ vec{3k}+ lambda( vec{2i}+ vec{j}- vec{k})` and the plane ` vec{r}.( vec{i}+ vec{j})=1`.

A

`frac{ pi}{3}`

B

`frac{ pi}{6}`

C

`frac{ pi}{2}`

D

`frac{ pi}{4}`

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