(ln((a*sqrt(x^2-1)+x*sqrt(1+a^2))/(a*sqrt(x^2-1)-x*sqrt(1+a^2)))*(1/(2*a*sqrt(1+a^2))))'(ln((a*sqrt(x^2-1)+x*sqrt(1+a^2))/(a*sqrt(x^2-1)-x*sqrt(1+a^2)))*(1/(2*a*sqrt(1+a^2))))'

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