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\left(\frac{ab}{c-b}+\frac{ab}{b+c}\right)^2-bc\left(\frac{(b+c)^2-a^2}{(b+c)^2}\right)
\left(\frac{ab}{c-b}+\frac{ab}{b+c}\right)^2-bc\left(\frac{(b+c)^2-a^2}{(b+c)^2}\right)
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