Выбрать замену, которая сводит уравнение [tex]\frac{1}{x^{2} +2x+1} + \frac{1}{x^{2} +2x+3} = \frac{5}{12}[/tex] к виду [tex]\frac{1}{t-a} + \frac{1}{t+a} = \frac{5}{12}[/tex]

Варианты ответов:
1) t = [tex]x^{2} +2x+2[/tex]
2) t = [tex]x^{2} +2x+1[/tex]
3) t = [tex]x^{2} +2x+3[/tex]
4) t = [tex]x^{2} +2x[/tex]
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