Помогите с примером
[tex] \frac{a}{ a^{2}-1} + \frac{ a^{2}+a-1 }{ a^{3}- a^{2}+a-1 } + \frac{ a^{2}-a-1 }{ a^{3}+ a^{2}+a+1 }- \frac{2 a^{3} }{ a^{4}-1 } [/tex]
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