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11.11.2020 •
Mathematics
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Ответ:
cos(2u + 2u) = cos²(2u) - sin²(2u)
cos(2u)cos(2u) - sin(2u)sin(2u) = cos²(2u) - sin²(2u)
cos²(2u) - sin²(2u) = cos²(2u) - sin²(2u)