2sin²X - 2sinXcosX=1. Created by leshik1112. algebra-ru

2sin²X - 2sinXcosX=1...

JaOw Task/25148335
--------------------
2sin²x - 2sinxcosx=1 ;
- 2sinxcosx= 1 -2sin²x;
* * * 1 - 2sin²x=cos²x+sin²x -2sin²x =cos²x-sin²x =cos2x * * *
-sin2x =cos2x ;
sin2x = -cos2x || :cos2x≠ 0
tg2x = -1
2x = -π/4 +π*k , k∈ℤ

x= -π/8 +(π/2)*k , k∈ℤ .

0 votes Thanks 0

oganesbagoyan исправьте

oganesbagoyan 2sin²X - 2sinXcosX=1 ⇔sin²X - 2sinXcosX-cos²X=0⇔ tg²X -2tgX -1 =0

oganesbagoyan

Verified answer

Ответ & & & & & & & & & & & & & & &

0 votes Thanks 0

Answers & Comments

Verified answer

pomogite pozhalujsta093b1d6bbb782b532b5280d50b8ede8e 37172

45 dimitiloktanon 2

dlya reakcii polnogo sgoraniya 21 molya etanola v kislorode rasschitajte obem polu

3 propildecin 5 strukturnuyu formulu pozhalujsta

brom massoj 6g polnostyu proreagiroval s fenolom soderzhavshemsya v 235 vodnogo ra

69 06hgt 1 srochno

805x 3105 40

log 06 4x1 1log06 8h

81...

055 h 162 srochno

рекомендуемые вопросы

Helpful Links

Helpful Social