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(sqrt(1+a)/(sqrt(1+a)-sqrt(1-a)))+((1-a)/(sqrt(1-a^2)-1+a))*(sqrt((1/a^2)-1)-(1/a))
(sqrt(1+a)/(sqrt(1+a)-sqrt(1-a)))+((1-a)/(sqrt(1-a^2)-1+a))*(sqrt((1/a^2)-1)-(1/a))
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