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[tex] \frac{ a^{2} }{ a^{2} - 1 } - \frac{a}{ a + 1
} [/tex]
[tex] \frac{ a^{2} }{ a^{2} - 1 } - \frac{a}{ a + 1
} [/tex]
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a² a a²-a*(a-1) a²-a²+a a
---------- - -------- = --------------------- = -------------------- = -----------
a²-1 a+1 (a-1)(a+1) (a-1)(a+1) a²- 1