ПОМОГИТЕ ПОЖАЛУЙСТА СРОЧНО С ПРИМЕРОМ !!!!!
Докажите тождество, при:
а НЕ равен - 1, +1
[tex]a + a ^{2} + \frac{2a ^{2} + 3a + 1 }{ {a}^{2} - 1 } - \frac{a ^{3} + 2a}{a - 1} = - 1[/tex]
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