Question:
If find the unit vector in the direction of
$\vec{a}=\hat{i}+\hat{j}+2 \hat{k}$ and $\vec{b}=2 \hat{i}+\hat{j}-2 \hat{k}$
(i) $6 \vec{b}$
(ii) 90$2 \vec{a}-\vec{b}$
Solution:
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