रेखा \(\overline{r} = (\hat{i} − \hat{j} + \hat{k}) + \lambda(2 \hat{i} − \hat{j} + 3 \hat{k})\) एवं समतल \(\overline{r} \cdot(2 \hat{i} + \hat{j} − \hat{k})\) = 4 के मध्य कोण है :

1
0
2
π/6
3
π/3
4
π/2

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