October 2021 0 13 Report
8) известно,что а=корень 1+cosx + корень 1-cosx и x принадлежит ( пи, 1/5пи ),выберите верное равенство 1. а = 2sin ( x/2+пи/4 )
2. а = -2sin ( x/2 + пи/4 )
3. а = 2sin ( x/2 - пи/4 )
4. другой ответ
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