Sin(2*a) / ((sin(a) + cos(a))^2 - 1) - sin(a)^2 - cos(a)^2

Question

Sin(2*a) / ((sin(a) + cos(a))^2 - 1) - sin(a)^2 - cos(a)^2

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Answer 1

Смотри  решение во вложение

Answer 2

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