The unit vector along \( \hat{i}+\hat{j} \) is: P (1) \( \hat{k} \)...

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The unit vector along \( \hat{i}+\hat{j} \) is:
P
(1) \( \hat{k} \)
(2) \( \hat{i}+\hat{j} \)
W
(3) \( \frac{\hat{i}+\hat{j}}{\sqrt{2}} \)
(4) \( \frac{\hat{i}+\hat{j}}{2} \)
4
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