Home
О нас
Products
Services
Регистрация
Войти
Поиск
Aborigen777
@Aborigen777
August 2022
1
7
Report
Помогите, пожалуйста))) 7sin^2 x+8cosx-8=0 [-пи/2;пи/2]
Please enter comments
Please enter your name.
Please enter the correct email address.
Agree to
terms of service
You must agree before submitting.
Send
Answers & Comments
sedinalana
7(1-cos²x+8cosx-8=0
7cos²x-8cosx+1=0
cosx=t
7t²-8t+1=0
a+b+c=0⇒t1=1 U t2=c/a
7-8+1=0⇒t1=1 U t2=1/7
cosx=1⇒x=2πn,n∈z
n=-1⇒x=-2π∉[-π/2;π/2]
n=0⇒x=0∈[-π/2;π/2]
n=1⇒x=2π∉[-π/2;π/2]
cosx=1/7⇒x=+-arccos1/7+2πn,n∈z
при n=0 x=-arccos1/7∈[-π/2;π/2] U x=arccos1/7∈[-π/2;π/2]
2 votes
Thanks 1
More Questions From This User
See All
Aborigen777
August 2022 | 0 Ответы
chto takoe krasota napishite nebolshoe esse
Answer
Aborigen777
July 2022 | 0 Ответы
pomogite s neravenstvom pozhalujsta46c54ea939b44e7f4a958b0c7627b132 97787
Answer
Aborigen777
July 2022 | 0 Ответы
pozhalujsta pomogite reshit uravnenief48f3a3c42b52af06748e036548c7f0d 67695
Answer
Aborigen777
July 2022 | 0 Ответы
v zadannoj sheme prevrashenij c2h2 x h2 yh2 nad strelkoj veshestvami
Answer
рекомендуемые вопросы
rarrrrrrrr
August 2022 | 0 Ответы
o chem dolzhny pozabotitsya v pervuyu ochered vzroslye pri organizacionnom vyvoze n
danilarsentev
August 2022 | 0 Ответы
est dva stanka na kotoryh vypuskayut odinakovye zapchasti odin proizvodit a zapcha
myachina8
August 2022 | 0 Ответы
najti po grafiku otnoshenie v3v1 v otvetah napisano 9 no nuzhno reshenie
ydpmn7cn6w
August 2022 | 0 Ответы
Choose the correct preposition: 1.I am fond (out,of,from) literature. 2.where ar...
millermilena658
August 2022 | 0 Ответы
opredelite kak sozdavalas i kto sozdaval arabskoe gosudarstvo v kracii
MrZooM222
August 2022 | 0 Ответы
ch ajtmanov v rasskaze krasnoe yabloko ispolzuet metod rasskaz v rasskaze opi
timobila47
August 2022 | 0 Ответы
kakovo bylo naznachenie kazhdoj iz chastej vizantijskogo hrama pomogite pozhalujsta
ivanyyaremkiv
August 2022 | 0 Ответы
moment. 6....
pozhalujsta8b98a56c0152a07b8f4cbcd89aa2f01e 97513
sarvinozwakirjanova
August 2022 | 0 Ответы
pomogite pozhalusto pzha519d7eb8246a08ab0df06cc59e9dedb 6631
×
Report "2]..."
Your name
Email
Reason
-Select Reason-
Pornographic
Defamatory
Illegal/Unlawful
Spam
Other Terms Of Service Violation
File a copyright complaint
Description
Helpful Links
О нас
Политика конфиденциальности
Правила и условия
Copyright
Контакты
Helpful Social
Get monthly updates
Submit
Copyright © 2024 SCHOLAR.TIPS - All rights reserved.
Answers & Comments
7cos²x-8cosx+1=0
cosx=t
7t²-8t+1=0
a+b+c=0⇒t1=1 U t2=c/a
7-8+1=0⇒t1=1 U t2=1/7
cosx=1⇒x=2πn,n∈z
n=-1⇒x=-2π∉[-π/2;π/2]
n=0⇒x=0∈[-π/2;π/2]
n=1⇒x=2π∉[-π/2;π/2]
cosx=1/7⇒x=+-arccos1/7+2πn,n∈z
при n=0 x=-arccos1/7∈[-π/2;π/2] U x=arccos1/7∈[-π/2;π/2]