262use a*(b*c)= (a.c)b-(a.b)c * →cross; . →dot
If \vec{a},\vec{b},\vec{c} are non-co-planar unit vectors such that \vec{a} x (\vec{b} x \vec{c}) = (\vec{b}+\vec{c})/(\sqrt{2}) , \vec{b} and \vec{c} are non parallel, then find the angle between \vec{a} and \vec{b}.
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