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\frac{\left(y^{-2}x^{2}+1\right)x^{-2}}{\left(-y^{-2}x^{2}+1\right)x^{-2}}\times \frac{x-y}{x+y}
Factor the expressions that are not already factored in \frac{x^{-2}+y^{-2}}{x^{-2}-y^{-2}}.
\frac{y^{-2}x^{2}+1}{-y^{-2}x^{2}+1}\times \frac{x-y}{x+y}
Cancel out x^{-2} in both numerator and denominator.
\frac{y^{-2}\left(x^{2}+y^{2}\right)}{y^{-2}\left(-x^{2}+y^{2}\right)}\times \frac{x-y}{x+y}
Factor the expressions that are not already factored in \frac{y^{-2}x^{2}+1}{-y^{-2}x^{2}+1}.
\frac{x^{2}+y^{2}}{-x^{2}+y^{2}}\times \frac{x-y}{x+y}
Cancel out y^{-2} in both numerator and denominator.
\frac{\left(x^{2}+y^{2}\right)\left(x-y\right)}{\left(-x^{2}+y^{2}\right)\left(x+y\right)}
Multiply \frac{x^{2}+y^{2}}{-x^{2}+y^{2}} times \frac{x-y}{x+y} by multiplying numerator times numerator and denominator times denominator.
\frac{\left(x-y\right)\left(x^{2}+y^{2}\right)}{\left(x+y\right)\left(x-y\right)\left(-x-y\right)}
Factor the expressions that are not already factored.
\frac{x^{2}+y^{2}}{\left(x+y\right)\left(-x-y\right)}
Cancel out x-y in both numerator and denominator.
\frac{x^{2}+y^{2}}{-x^{2}-2xy-y^{2}}
Expand the expression.
\frac{\left(y^{-2}x^{2}+1\right)x^{-2}}{\left(-y^{-2}x^{2}+1\right)x^{-2}}\times \frac{x-y}{x+y}
Factor the expressions that are not already factored in \frac{x^{-2}+y^{-2}}{x^{-2}-y^{-2}}.
\frac{y^{-2}x^{2}+1}{-y^{-2}x^{2}+1}\times \frac{x-y}{x+y}
Cancel out x^{-2} in both numerator and denominator.
\frac{y^{-2}\left(x^{2}+y^{2}\right)}{y^{-2}\left(-x^{2}+y^{2}\right)}\times \frac{x-y}{x+y}
Factor the expressions that are not already factored in \frac{y^{-2}x^{2}+1}{-y^{-2}x^{2}+1}.
\frac{x^{2}+y^{2}}{-x^{2}+y^{2}}\times \frac{x-y}{x+y}
Cancel out y^{-2} in both numerator and denominator.
\frac{\left(x^{2}+y^{2}\right)\left(x-y\right)}{\left(-x^{2}+y^{2}\right)\left(x+y\right)}
Multiply \frac{x^{2}+y^{2}}{-x^{2}+y^{2}} times \frac{x-y}{x+y} by multiplying numerator times numerator and denominator times denominator.
\frac{\left(x-y\right)\left(x^{2}+y^{2}\right)}{\left(x+y\right)\left(x-y\right)\left(-x-y\right)}
Factor the expressions that are not already factored.
\frac{x^{2}+y^{2}}{\left(x+y\right)\left(-x-y\right)}
Cancel out x-y in both numerator and denominator.
\frac{x^{2}+y^{2}}{-x^{2}-2xy-y^{2}}
Expand the expression.