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Dariga2223021999
@Dariga2223021999
July 2022
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решите один из них , пожалуйста
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ewgenijbark
Verified answer
Cos2x+5cosx+3≥0
cos²x-sin²x+5cosx+3≥0
cos²x-1+cos²x+5cosx+3≥0
cosx=t
2t²+5t+2≥0
D=9
t1= - 2, t2= - 0.5
-1≤cosx≤1
cosx≥0.5
x∈[-2π/3+2πk, 2π/3+2πk], k∈Z
Ответ В
1 votes
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Answers & Comments
Verified answer
Cos2x+5cosx+3≥0cos²x-sin²x+5cosx+3≥0
cos²x-1+cos²x+5cosx+3≥0
cosx=t
2t²+5t+2≥0
D=9
t1= - 2, t2= - 0.5
-1≤cosx≤1
cosx≥0.5
x∈[-2π/3+2πk, 2π/3+2πk], k∈Z
Ответ В