4.) 2cos²x+√3cosx=0, sin x меньше 0.. Created by MersedesBrabus2016. algebra-ru

4.) 2cos²x+√3cosx=0, sin x меньше 0...

MersedesBrabus2016 @MersedesBrabus2016

July 2022 1 13 Report

4.) 2cos²x+√3cosx=0, sin x меньше 0.

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$\left \{ {{2cos^2x+\sqrt3cosx=0} \atop {sinx\ \textless \ 0\qquad \quad }} \right. \\\\2cos^2x+\sqrt3cosx=0\\\\cosx(2cosx+\sqrt3)=0\\\\1)\; \; cosx=0\; ,\; \; x= \frac{\pi }{2}+\pi n,\; n\in Z\\\\2)\; \; cosx=-\frac{\sqrt3}{2}\; ,\; \; x=\pm (\pi -\frac{\pi}{6})+2\pi m=\pm \frac{5\pi }{6}+2\pi m,\; m\in Z\\\\3)\; \; sinx\ \textless \ 0\; \; ,\; \; -\pi +2\pi k\ \textless \ x\ \textless \ 2\pi k\; ,\; k\in Z\; \; \Rightarrow \; \; \\\\x_1=-\frac{\pi}{2}+2\pi n\; ,\; n\in Z\\\\x_2=-\frac{5\pi}{6}+2\pi m,\; m\in Z$

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pomogite reshit zadachi dayu 30 ballov 1 cherez tochku peresecheniya diagonal

35 ballov 1 otrezok dlina kotorogo ravna 17 sm ne imeet obshih tochek s plosk

x x 2

x x1 zhelatelno s obyasneniyami zaranee spasibo

rebyata pomogite pozhalujsta ochen i ochen nado dayu 20 ballov 1 kakie izdeliya

dayu 20 ballov pozhalujsta pomogitesrochno 1 tgx 12cosx10 cosx menshe

pomogite dayu 10 ballov tgx3tgx cos x menshe 0

pomogite pozhalujsta ochen srochno dayu 15 ballov 2cos x 12cos10 s

pomogite dayu 20 ballov zhelatelno s obyasneniyami chtoby ponyat kak reshaetsya

4 polozhitelny

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