упростите выражение (1-2ab/a^2+b^2):a^2-b^2/a^2+b^2
помогите плиззззз. Есть варианты ответов
А)(a^2-b^2)^2/(a^2+b^2)^2
Б)a^2+b^2
В)a-b/a+b
Г)1
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