Task 2. Complete the sentences with verbs must/mustn t 1. We 2. We 3. We 4. We 5. We 6. We 7. We 8. - id1684393820230107 от варя373 07.01.2023 18:36

Question

Алгебра: Task 2. Complete the sentences with verbs must/mustn t 1. We 2. We 3. We 4. We 5. We 6. We 7. We 8. We 9. We 10. We be quiet in the class listen to loud music late at night take an umbrella because it s raining speak loudly in a library go to the dentist if our teeth aches make noise at school wash our hands before lunch listen to our parents break the windows at school eat lots of sweetsу ​

варя373 · Accepted Answer

1 Пример 1. 2sin(3x - p/4) -1 = 0. Решение. Решим уравнение относительно sin(3x - p/4).  sin(3x - p/4) = 1/2, отсюда по формуле решения уравнения sinx = а нахо­дим  3х - p/4 = (-1)n arcsin 1/2 + np, nÎZ. Зх - p/4 = (-1)n p/6 + np, nÎZ; 3x = (-1)n p/6 + p/4 + np, nÎZ; x = (-1)n p/18 + p/12 + np/3, nÎZ Если k = 2n (четное), то х = p/18 + p/12 + 2pn/3, nÎZ. Если k = 2n + 1 (нечетное число), то х = - p/18 + p/12 + ((2pn + 1)p)/3 =  = p/36 + p/3 + 2pn/3 = 13p/36 + 2pn/3, nÎz. ответ: х1 = 5p/6 + 2pn/3,nÎZ,...

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