Выполнить действия

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


2) [tex] (\frac{1}{y} +\frac{2}{x-y})*(x-\frac{x^2+y^2}{x+y} ) [/tex]
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