Let B > 0. Show that the maximum of (x 1 , . . . , x
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Let B > 0. Show that the maximum of ƒ(x1, . . . , xn) = x1 + · · · + xn subject to x21 + · · · + x2n = B2 is √nB. Conclude that
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for all numbers a,..., an lal++lanl n(a + + a) / 1/2
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