a²/a²+2a*(a²/a-2-4/a-2)
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a²/a²+2a*(a²/a-2-4/a-2)
a²/a²+2a*(a²/a-2-4/a-2)
a²/a²+2a*(a²/a-2-4/a-2)
a²/a²+2a*(a²/a-2-4/a-2)
=a²/a(a+2)*(a²-4)/(a-2)
=a/(a+2)*(a+2)(a-2)/(a-2)
=a
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