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If a(1),a(2),a(3), . . .,a(n) are non-ze...

If `a_(1),a_(2),a_(3), . . .,a_(n)` are non-zero real numbers such that
`(a_(1)^(2)+a_(2)^(2)+ . .. +a_(n-1).^(2))(a_(2)^(2)+a_(3)^(2)+ . . .+a_(n)^(2))le(a_(1)a_(2)+a_(2)a_(3)+ . . . +a_(n-1)a_(n))^(2)" then", a_(1),a_(2), . . . .a_(n)` are in

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