Ctg(3п/2+х)+2сtg(3п/2-х)≤ -1. Created by Анастасия2048761. algebra-ru

2-х)≤ -1...

Анастасия2048761 @Анастасия2048761

October 2021 1 7 Report

Ctg(3п/2+х)+2сtg(3п/2-х)≤ -1

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Freakazoid

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

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