tex]Поиогите...

hokage21 @hokage21

June 2022 1 6 Report

[tex] \cos(2x) \leqslant - \frac{1}{2} [/tex]

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NNNLLL54

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$cos(2x)\leq -\frac{1}{2}\\\\\frac{2\pi}{3}+2\pi n\leq 2x\leq \frac{4\pi }{3}+2\pi n\; ,\; n\in Z\\\\\frac{\pi}{3}+\pi n\leq x\leq \frac{2\pi }{3}+\pi n\; ,\; n\in Z$

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