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manshuk01023
@manshuk01023
August 2022
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Помогите пожалуйста решить неравенство: cos^2 (2x) - sin^2 (2x) меньше или ровно 1/2
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sedinalana
Verified answer
Cos²(2x)-sin²(2x)≤1/2
cos(4x)≤1/2
π/3+2πn≤4x≤5π/3+2πn
π/12+πn/2≤x≤5π/12+πn/2,n∈z
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Verified answer
Cos²(2x)-sin²(2x)≤1/2cos(4x)≤1/2
π/3+2πn≤4x≤5π/3+2πn
π/12+πn/2≤x≤5π/12+πn/2,n∈z