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प्रश्न
If `veca, vecb, vecc` are vectors such that `[veca, vecb, vecc]` = 4, then `[veca xx vecb, vecb xx vecc, vecc xx veca]` =
विकल्प
16
64
4
8
MCQ
उत्तर
16
Explanation:
We have, `[veca xx vecb, vecb xx vecc, vecc xx veca]`
= `(veca xx vecb) * {(vecb xx vecc) xx (vecc xx veca)}`
= `(veca xx vecb) * {(vecm . veca) vecc - (vecm * vecc) veca)} ` .....(where `vecm = vecb xx vecc`)
= `{(veca xx vecb) * vecc} * {(veca * (vecb xx vecc)}`
= `[veca, vecb, vecc]^2`
= 42
= 16.
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