a+b= \frac{a²-b²}{a-b}

a-b= \frac{a²-b²}{a+b}

a+b= \frac{a²-b²}{a-b}

a-b= \frac{a²-b²}{a+b}

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If we take a=b=\color{red}{0} ?

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This is not define for a=b.

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