Evaluate
-\frac{\left(\sqrt{x+y}-\sqrt{x-y}\right)^{2}}{2\sqrt{x^{2}-y^{2}}\left(-\sqrt{x^{2}-y^{2}}+x\right)}
Differentiate w.r.t. x
\frac{-x\left(x^{2}-y^{2}\right)^{\frac{3}{2}}-3x\sqrt{x^{2}-y^{2}}y^{2}+2y^{2}|x^{2}-y^{2}|+5\sqrt{x^{2}-y^{2}}x^{3}-4x^{2}|x^{2}-y^{2}|+\left(x^{2}-y^{2}\right)^{2}+y^{4}-x^{4}}{2\left(\left(-\sqrt{x^{2}-y^{2}}+x\right)\left(x^{2}-y^{2}\right)\right)^{2}}
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