cos2x

July 2021 1 17 Report

cos2x<-0,5 решите неравенство

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NNNLLL54

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$cos2x\ \textless \ -0,5\\\\\frac{2\pi}{3}+2\pi n\ \textless \ 2x\ \textless \ \frac{4\pi}{3}+2\pi n,\; n\in Z\\\\\frac{\pi}{3}+\pi n\ \textless \ x\ \textless \ \frac{2\pi}{3}+\pi n,\; n\in Z$

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NNNLLL54 Нет. На тригон. круге смотрим или по графикам.

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