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JEEMAIN-2014
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If $a,b,c$ are non- Coplanar unit vector such that $a \times (b \times c) = \large\frac{b+c}{\sqrt 2}$, then the angle between a and b is
$\begin{array}{1 1} \frac{3 \pi}{4} \\ \frac{\pi}{4} \\ \frac{\pi}{2} \\ \pi \end{array} $
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