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{ ( 1/(1/a - 1/b))^2 * (1+ b/a)/(1- b/a) * [ (a/b - 1)^3 / (a^3/b + a^2)] }^20=
{ ( 1/(1/a - 1/b))^2 * (1+ b/a)/(1- b/a) * [ (a/b - 1)^3 / (a^3/b + a^2)] }^20=
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