как найти ctg(-2*pi/3) или sin(2*pi/3)?. Created by TatianaElizarova. algebra-ru

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August 2021 1 22 Report

как найти ctg(-2*pi/3) или sin(2*pi/3)?

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DimaPuchkov $ctg(-\frac{2 \pi}{3})=-ctg(\frac{2 \pi}{3})=-ctg(\pi - \frac{\pi}{3})=-(-ctg (\frac{\pi}{3}))=ctg (\frac{\pi}{3})=\frac{\sqrt{3}}{3} \\ \\ \sin (\frac{2 \pi}{3})= \sin (\pi - \frac{\pi}{3})=\sin (\frac{\pi}{3})=\frac{\sqrt{3}}{2}$

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TatianaElizarova August 2022 | 0 Ответы

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TatianaElizarova August 2022 | 0 Ответы

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