срочно,докажите тождество. Created by Lidanext. algebra-ru

срочно,докажите тождество...

Lidanext @Lidanext

August 2021 1 12 Report

срочно,докажите тождество

Answers & Comments

oganesbagoyan

Verified answer

Доказать тождество :
(1 - 2sin²α)/sin2α -(cos3α - cosα)/(sin3α+sinα) =1/sin2α.
--------------------------------------------------------------------------------
(1 - 2sin²α)/sin2α -(cos3α - cosα)/(sin3α+sinα) =
(1 - 2sin²α)/2sinα*cosα - (-2sin2α*sinα)/2sin2α*cosα =
(1 - 2sin²α)/2sinα*cosα +sinα/cosα =(1-2sin²α +2sinα*sinα)/2sinα*cosα =1/sin2α.
************************* использованы формулы ********************************
sin2α =2sinα*cosα ;
cosα - cosβ = -2 sin(α-β)/2 * sin(α+β)/2 ;
sinα + sinβ = 2 sin(α+β)/2 * cos(α-β)/2

1 votes Thanks 2

Answers & Comments

Verified answer

privetv himii nichego ne ponimayuvot proshu vashej pomoshi

mne ochen nuzhno vosem zadach po paskalyuchtoby rabotalivyruchajterebyat

pomogite pozhalujsta s algebroj nuzhno do zavtra

dokazhite tozhdestvo sin2l 1 sinv kvadratel2tgl 1 tgv kvadratel

pozhalujsta dokazhite tozhdestvo

pozhalujstamne srochno nuzhno pozhalujstaaavtoraya zadacha u menya est

vychislite massu osadkapoluchennogo pri vzaimodejstvii 200 g 10 go rastvora sul

reshite pozhalujsta mne srochno 99101102 i 107

ogromnoe pozhaaalujsta 10199107102 chto smozhete

kak razlichit himicheskim putem butadien ot butina

рекомендуемые вопросы

Helpful Links

Helpful Social