tex]...

October 2021 1 7 Report

[tex]cos \frac{x}{3} \leq \frac{ \sqrt{3} }{2} [/tex]

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Verified answer

Cosx/3 ≤ √3/2
π/6 ≤ x/3 ≤ 2π -π/6;
π/6 ≤ x/3 ≤ 11π/6;
2π*k+ π/6 ≤ x/3 ≤ 11π/6 + 2π*k ;
6π*k+ π/2 ≤ x ≤ 11π/2 + 6π*k ; K∈Z

совокупность отрезов вида x∈ [ 6π*k+ π/2 ; 11π/2 + 6π*k] ; K∈Z

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