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watall777
@watall777
July 2022
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решите тригонометрическое уравнение,пожалуйста!
3cos 2x - 14cos x + 7 = 0
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kalbim
Verified answer
Замена
: cosx=t∈[-1;1]
- посторонний корень
Вернемся к замене
:
, k∈Z
2 votes
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watall777
СПАСИБО!!!
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Answers & Comments
Verified answer
Замена: cosx=t∈[-1;1]
- посторонний корень
Вернемся к замене:
, k∈Z