November 2021 0 8 Report
Довести тотожність сos² 2a-sin²2a=cos⁴2a-sin⁴2a для доведення застосуємо метод перетворення його правої частини до лівої
cos⁴2a-sin⁴2a=(cos²2a-sin²2a)(cos²2a+sin²2a)
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