(m-m)/(m+n)-(m^2+n^2)/(m^2-n^2)

Question

(m-m)/(m+n)-(m^2+n^2)/(m^2-n^2)

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Answer 1

(m-n)(m-n)-m^2-n^2

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m^2-n^2

 

m^2-2mn+n^2-m^2-n^2

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m^2+n^2

 

-2mn

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m^2-n^2