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\frac{\left(x-2\right)\left(x+2\right)\left(x^{2}+4\right)}{x^{2}+4}
Factor the expressions that are not already factored.
\left(x-2\right)\left(x+2\right)
Cancel out x^{2}+4 in both numerator and denominator.
x^{2}-4
Expand the expression.
\frac{\left(x-2\right)\left(x+2\right)\left(x^{2}+4\right)}{x^{2}+4}
Factor the expressions that are not already factored.
\left(x-2\right)\left(x+2\right)
Cancel out x^{2}+4 in both numerator and denominator.
x^{2}-4
Expand the expression.