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(a-a^(-2))/(a^(1/2)-a^(-1/2))-2/a^(3/2)-(1-a^(-2))/(a^(1/2)+a^(-1/2))
(a-a^(-2))/(a^(1/2)-a^(-1/2))-2/a^(3/2)-(1-a^(-2))/(a^(1/2)+a^(-1/2))
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