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solve (-t1*k-t2*k)/((t1/t2+1)*(t2/t1+1))=-A*pi/(4*m*sqrt(A^2-a^2)) for A
solve (-t1*k-t2*k)/((t1/t2+1)*(t2/t1+1))=-A*pi/(4*m*sqrt(A^2-a^2)) for A
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