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Which of the following is the domain of (a1,a2,…,an)(a_1,a_2,…,a_n )(a1,a2,…,an) and (b1,b2,…,bn)(b_1,b_2,…,b_n )(b1,b2,…,bn), such that we will always have
(a12+a22+⋯+an2)(b12+b22+⋯+bn2)≥(a1b1+a2b2+⋯+anbn)2(a_1^2+a_2^2+⋯+a_n^2 )(b_1^2+b_2^2+⋯+b_n^2 )≥(a_1 b_1+a_2 b_2+⋯+a_n b_n )^2(a12+a22+⋯+an2)(b12+b22+⋯+bn2)≥(a1b1+a2b2+⋯+anbn)2
Choose the most suitable answer.
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