Question

VECTORS

If $\stackrel{\rightarrow}{a}\$ and $\stackrel{\rightarrow}{b}\$ are unit vectors, then what is the angle between $\stackrel{\rightarrow}{a}\$ and $\stackrel{\rightarrow}{b}\$ , so that ${\sqrt{2}}$ $\stackrel{\rightarrow}{a}\$ - $\stackrel{\rightarrow}{b}\$ is a unit vector ?

Appeared on CBSE 2015 Board Exam

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