Срочноооо! Пожалуйста умоляю Вариант Б1. Created by marinayarosh1984. algebra-ru

Срочноооо! Пожалуйста умоляю Вариант Б1...

marinayarosh1984 @marinayarosh1984

July 2022 1 9 Report

Срочноооо! Пожалуйста умоляю
Вариант Б1

Answers & Comments

$a) \: \: \: \: \frac{ \cos70 ° \cos10° +\sin70° \sin10°}{\sin50°\cos10° +\cos50 ° \sin10°} = \\ = \frac{ \cos(70° - 10°) }{ \sin(50° + 10°) } = \\ = \frac{ \cos60°}{ \sin60°} = \ctg60° = \frac{ \sqrt{3} }{3}$

$б) \cos105 ° = \cos(45 °+ 60 °) = \\ = cos45°cos60° - sin45°sin60° = \\ = \frac{ \sqrt{2} }{2} \times \frac{ 1 }{2} - \frac{ \sqrt{2} }{2} \times \frac{ \sqrt{3} }{2} = \frac{ \sqrt{2} - \sqrt{6} }{4}$

$a) \: \: \: \: \: \: \frac{ \cos( \alpha - \beta ) }{sin \alpha \: cos\beta } = ctg\alpha + \: tg\beta \\ \frac{cos \alpha cos \beta + sin \alpha sin \beta }{sin \alpha \: cos\beta } = ctg\alpha + \: tg\beta \\ \frac{cos \alpha cos \beta}{sin \alpha \: cos\beta} + \frac{sin \alpha sin \beta}{sin \alpha \: cos\beta} = ctg\alpha + \: tg\beta \\ ctg\alpha + \: tg\beta =ctg\alpha + \: tg\beta \\$

$б) \: \: \: \sin( \frac{\pi}{6} + \alpha ) + \sin( \frac{\pi}{6} - \alpha ) = \cos \alpha \\ sin \frac{\pi}{6} cos \alpha + cos \frac{\pi}{6} sin \alpha + sin \frac{\pi}{6} cos \alpha - cos \frac{\pi}{6} sin \alpha = cos \alpha \\ \frac{1}{2} cos \alpha + \frac{1}{2} cos \alpha = cos \alpha \\ cos \alpha = cos \alpha$

$tg \alpha = 2 \\ tg \beta = 1 \\ \tg( \alpha + \beta ) = \frac{tg \alpha + tg \beta }{1 - tg \alpha \: tg \beta } = \\ = \frac{2 + 1}{1 - 2 \times 1} = \frac{3}{ - 1} = - 3$

1 votes Thanks 1

Answers & Comments

reading pomogite pozhalujsta

srochnooo proshu pomogite variant v1

rewrite the sentences in the passive pomogite pozhalujsta

past tenses pomogite pozhalujsta

comparative structures pomogite pozhalujsta

reported speech pomogite

modal verbs for speculation pomogite pozhalujsta

present tenses pomogite pozhalujsta

pomogite vybrat pravilnyj otvet2558d1e4b47d6e532e89252b5df080a1 40315

16the garden is looking great at the moment on it a you have worked

рекомендуемые вопросы

Helpful Links

Helpful Social