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Differentiate w.r.t. x
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\frac{\frac{8x^{2}y^{2}}{x^{2}-y^{2}}}{\frac{x\left(x+y\right)}{\left(x+y\right)\left(x-y\right)}-\frac{x\left(x-y\right)}{\left(x+y\right)\left(x-y\right)}}
To add or subtract expressions, expand them to make their denominators the same. Least common multiple of x-y and x+y is \left(x+y\right)\left(x-y\right). Multiply \frac{x}{x-y} times \frac{x+y}{x+y}. Multiply \frac{x}{x+y} times \frac{x-y}{x-y}.
\frac{\frac{8x^{2}y^{2}}{x^{2}-y^{2}}}{\frac{x\left(x+y\right)-x\left(x-y\right)}{\left(x+y\right)\left(x-y\right)}}
Since \frac{x\left(x+y\right)}{\left(x+y\right)\left(x-y\right)} and \frac{x\left(x-y\right)}{\left(x+y\right)\left(x-y\right)} have the same denominator, subtract them by subtracting their numerators.
\frac{\frac{8x^{2}y^{2}}{x^{2}-y^{2}}}{\frac{x^{2}+xy-x^{2}+xy}{\left(x+y\right)\left(x-y\right)}}
Do the multiplications in x\left(x+y\right)-x\left(x-y\right).
\frac{\frac{8x^{2}y^{2}}{x^{2}-y^{2}}}{\frac{2xy}{\left(x+y\right)\left(x-y\right)}}
Combine like terms in x^{2}+xy-x^{2}+xy.
\frac{8x^{2}y^{2}\left(x+y\right)\left(x-y\right)}{\left(x^{2}-y^{2}\right)\times 2xy}
Divide \frac{8x^{2}y^{2}}{x^{2}-y^{2}} by \frac{2xy}{\left(x+y\right)\left(x-y\right)} by multiplying \frac{8x^{2}y^{2}}{x^{2}-y^{2}} by the reciprocal of \frac{2xy}{\left(x+y\right)\left(x-y\right)}.
\frac{4xy\left(x+y\right)\left(x-y\right)}{x^{2}-y^{2}}
Cancel out 2xy in both numerator and denominator.
\frac{4xy\left(x+y\right)\left(x-y\right)}{\left(x+y\right)\left(x-y\right)}
Factor the expressions that are not already factored.
4xy
Cancel out \left(x+y\right)\left(x-y\right) in both numerator and denominator.