Home
О нас
Products
Services
Регистрация
Войти
Поиск
oleg1836
@oleg1836
June 2022
1
11
Report
2 cos^2 x + sin (π/2 - x) - 1 = 0
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
bayd
2 cos² x + sin (pi/2 - x) - 1 = 0
2 cos² x + cos x - 1 = 0
Пояснение: sin (pi/2 - x) = cos x
Вводим замену cos x = t
Решаем квадратное уравнение:
2t² + t - 1 = 0
D = b² - 4ac = 1² - (-4*2*1) = 1 + 8 = 9 √D = 3
t1 = (-1+3)/2 = 1
t2 = (-1-3)/2= -2
cos x = 1
x = 2 pik, k ∈ Z
cos x = -2 ∅, т.к. cos x ∈ отрезку [ -1; 1 ], -2 не входит в этот промежуток
ОТВЕТ: 2 pik, k ∈ Z
4 votes
Thanks 0
More Questions From This User
See All
oleg1836
August 2022 | 0 Ответы
horda v geometrii pozhalujsta pomogite
Answer
oleg1836
August 2022 | 0 Ответы
organicheskoe veshestvo imeet plotnost po oksidu sery iv 1344 pri szhiganii 0
Answer
oleg1836
August 2022 | 0 Ответы
tex kl3a660f7d6b3767157a43abcbb5699274 34618
Answer
oleg1836
July 2022 | 0 Ответы
na cokole avtomobilno lampochki napisano 20 vt 12 v kakuyu rabotu sovershit e
Answer
oleg1836
July 2022 | 0 Ответы
pri soprotivlenii reostata 1 om napryazhenie na zazhimah istochnika toka bylo 15 v
Answer
oleg1836
July 2022 | 0 Ответы
sila toka v katushke umenshilas s 16 do 12 a pri etom energiya eyo magnitnogo pol
Answer
oleg1836
July 2022 | 0 Ответы
elektron i proton vletayut v odnorodnoe magnitnoe pole perpendikulyarno vektoru ma6a2a6ba6763d69aed5c172bfd2792d6e 71653
Answer
oleg1836
July 2022 | 0 Ответы
maksimalnoe napryazhenie na kondensatore kolebatelnogo kontura sostavlyaet 90 v
Answer
oleg1836
June 2022 | 0 Ответы
sin2 x 2 sin p x cos x 3 cos2 2p x 0
Answer
oleg1836
October 2021 | 0 Ответы
na risunke 12 izobrazhyon uchastok cepi soderzhashij rezistory soprotivleniyami r1
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 - x) - 1 = 0..."
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
2 cos² x + cos x - 1 = 0
Пояснение: sin (pi/2 - x) = cos x
Вводим замену cos x = t
Решаем квадратное уравнение:
2t² + t - 1 = 0
D = b² - 4ac = 1² - (-4*2*1) = 1 + 8 = 9 √D = 3
t1 = (-1+3)/2 = 1
t2 = (-1-3)/2= -2
cos x = 1
x = 2 pik, k ∈ Z
cos x = -2 ∅, т.к. cos x ∈ отрезку [ -1; 1 ], -2 не входит в этот промежуток
ОТВЕТ: 2 pik, k ∈ Z