If a, b, c and d are the unit vectors such that (a × b) ·(c × d)=1 and a · c=1/2, then (a) 𝐚, 𝐛...

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If a, b, c and d are the unit vectors such that (a × b) ·(c × d)=1 and a · c=1/2, then
(a) 𝐚, 𝐛, care non-coplanar
(b) a,b, d are non-coplanar
(c) b, d are non-parallel
(d) 𝐚, 𝐝 are parallel and 𝐛, c are parallel

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4:00 onwards focus on green part (for self revision)

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