m/(m-n)^2-n/(n-m)^2
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m/(m-n)^2-n/(n-m)^2
m/(m-n)^2-n/(n-m)^2
m/(m-n)^2-n/(n-m)^2
m/(m-n)^2-n/(n-m)^2
=m/(m-n)^2-n/(m-n)^2
=(m-n)/(m-n)^2
=1/(m-n)
=m/(m-n)² -n/(m-n)²
=(m-n)/(m-n)²
=1/(m-n)
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