((t - u)^2)/(t^2 - u^2) = ((t - u)^2)/((t - u)(t + u)) = (t - u)/(t + u)
решено)))))))))))))))
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((t - u)^2)/(t^2 - u^2) = ((t - u)^2)/((t - u)(t + u)) = (t - u)/(t + u)
решено)))))))))))))))