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\frac{a^{2}-4}{\left(a^{2}+a-8\right)\left(a^{2}-4\right)}\times \frac{a^{2}-4a+4}{a-2}
Express \frac{\frac{a^{2}-4}{a^{2}+a-8}}{a^{2}-4} as a single fraction.
\frac{1}{a^{2}+a-8}\times \frac{a^{2}-4a+4}{a-2}
Cancel out a^{2}-4 in both numerator and denominator.
\frac{1}{a^{2}+a-8}\times \frac{\left(a-2\right)^{2}}{a-2}
Factor the expressions that are not already factored in \frac{a^{2}-4a+4}{a-2}.
\frac{1}{a^{2}+a-8}\left(a-2\right)
Cancel out a-2 in both numerator and denominator.
\frac{a-2}{a^{2}+a-8}
Express \frac{1}{a^{2}+a-8}\left(a-2\right) as a single fraction.
\frac{a^{2}-4}{\left(a^{2}+a-8\right)\left(a^{2}-4\right)}\times \frac{a^{2}-4a+4}{a-2}
Express \frac{\frac{a^{2}-4}{a^{2}+a-8}}{a^{2}-4} as a single fraction.
\frac{1}{a^{2}+a-8}\times \frac{a^{2}-4a+4}{a-2}
Cancel out a^{2}-4 in both numerator and denominator.
\frac{1}{a^{2}+a-8}\times \frac{\left(a-2\right)^{2}}{a-2}
Factor the expressions that are not already factored in \frac{a^{2}-4a+4}{a-2}.
\frac{1}{a^{2}+a-8}\left(a-2\right)
Cancel out a-2 in both numerator and denominator.
\frac{a-2}{a^{2}+a-8}
Express \frac{1}{a^{2}+a-8}\left(a-2\right) as a single fraction.