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solve (-T1*k-T2*k)/((T1/T2 +1)*((T2/T1)+1)) = (A*Pi)/(4*M*(1-(a/A)^2)^(1/2)), A
solve (-T1*k-T2*k)/((T1/T2 +1)*((T2/T1)+1)) = (A*Pi)/(4*M*(1-(a/A)^2)^(1/2)), A
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