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[tex] \frac{2a - 4}{ {a} ^{2} + 4} \div \frac{ {a}^{2} - 4 + 6 }{ {a}^{4} - 16} [/tex]
[tex] \frac{2a - 4}{ {a} ^{2} + 4} \div \frac{ {a}^{2} - 4 + 6 }{ {a}^{4} - 16} [/tex]
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