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SD(E) af (0)?°D = Aest. (1) (umbiared): < Aust-A>=0. (2). <(A-Aest )²>=0² minimised. = <A²>-2<A Aert > + <Aest>. 2. A²-2A <Aest>+< Aest >. <Aest >= < S(AT+N) ...



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