If \( a, b, c \) are non-coplanar unit vectors such that
\( \mathrm... VIDEO
If \( a, b, c \) are non-coplanar unit vectors such that
\( \mathrm{P} \) \( a \times(b \times c)=\frac{b+c}{\sqrt{2}} \), then the angle between \( a \) and \( b \)
W is:
(1) \( \frac{\pi}{4} \)
(2) \( \frac{\pi}{2} \)
(3) \( \frac{3 \pi}{4} \)
(4) \( \pi \)
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