Let |a| ≠ 0, |b| ≠ 0.Then a × (b × a) = |a|² b – |a|² b holds if and only if - NDA Mathematics 2018 (II)

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Let |a| ≠ 0, |b| ≠ 0.
Then a × (b × a) = |a|² b – |a|² b holds if and only if