Home
О нас
Products
Services
Регистрация
Войти
Поиск
adadol
@adadol
July 2022
1
30
Report
тема триганометрия РЕШИТЕ ПОЖАЛУЙСТА
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
nKrynka
Решение
1) sin(π - x) - cos(3π/2 - x) = √2
sinx + cosx = √2
преобразуем левую часть уравнения:
sinx + cosx =
√2(cosx/√2 + sinx/√2) =
√2[sin(π/4) * cosx + cos(π/4) * sinx] = √2sin(π/4 + x)
Получаем уравнение:
√2sin(π/4 + x) = √2
делим на √2, получаем:
sin(π/4 + x) = 1
π/4 + x = π/2 + 2πn, n ∈ Z
x = π/4 + 2πn, n ∈ Z
2) sinα = - 24/25 π < α < 3π/2
cosα = - √(1 - sin²α) = - √(1 - (24/25)²) = - √(1 - (576/625)) = - √(49/625) = - 7/25
3) sin²x + 8sinx - 9 = 0
sinx = t, IsinxI ≤ 1
t² + 8t - 9 = 0
t₁ = - 9 не удовлетворяет условию IsinxI ≤ 1
t₂ = 1
sinx = 1
x = π/2 + 2πk, k ∈ Z
4) 2cos²x - 9cosx - 5 = 0
cosx = t, IcosxI ≤ 1
2t² - 9t - 5 = 0
D = 81 + 4*2*5 = 121
t₁ = (9 - 11)/4 = - 1/2
t₂ = (9 + 11)/4 = 5 не удовлетворяет условию
IcosxI ≤ 1
cosx = - 1/2
x = (+ -)arccos(- 1/2) + 2πn, n ∈ Z
x = (+ -) * (π - π/3)+ 2πn, n ∈ Z
x = (+ -) * (2π/3
)+ 2πn, n ∈ Z
2 votes
Thanks 1
adadol
а 2 фотку
More Questions From This User
See All
adadol
August 2022 | 0 Ответы
reshite pozhalujstab6a81e16bb52603374aa755339bae8a8 47626
Answer
adadol
August 2022 | 0 Ответы
reshite pozhalujsta230da3f6a3864376853670c525227bde 28742
Answer
adadol
August 2022 | 0 Ответы
reshite pozhalujsta83814433d79e8d30673a9e44f129b922 22592
Answer
adadol
August 2022 | 0 Ответы
reshite pozhalujstad3cf957a6733d2bdc1180966ad4a68db 18510
Answer
adadol
August 2022 | 0 Ответы
reshite pozhalujsta temalogarifmicheskaya funkciya
Answer
adadol
July 2022 | 0 Ответы
reshite pozhalujsta tema pokazatelnaya funkciya
Answer
adadol
July 2022 | 0 Ответы
temavozrostanie ubyvanie i ekstrimum funkcij 1najti stacionarnye tochki fx
Answer
adadol
July 2022 | 0 Ответы
pomagit pozhalujsta srochno najti naimenshee znachenie funkcii fxx325x2 2x
Answer
adadol
July 2022 | 0 Ответы
tema telo vrasheniya
Answer
adadol
July 2022 | 0 Ответы
reshite pozhalujsta reshit vse krome 3i 5 vo 2 chasti
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 "тема триганометрия РЕШИТЕ ПОЖАЛУЙСТА..."
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
1) sin(π - x) - cos(3π/2 - x) = √2
sinx + cosx = √2
преобразуем левую часть уравнения:
sinx + cosx = √2(cosx/√2 + sinx/√2) =
√2[sin(π/4) * cosx + cos(π/4) * sinx] = √2sin(π/4 + x)
Получаем уравнение:
√2sin(π/4 + x) = √2
делим на √2, получаем:
sin(π/4 + x) = 1
π/4 + x = π/2 + 2πn, n ∈ Z
x = π/4 + 2πn, n ∈ Z
2) sinα = - 24/25 π < α < 3π/2
cosα = - √(1 - sin²α) = - √(1 - (24/25)²) = - √(1 - (576/625)) = - √(49/625) = - 7/25
3) sin²x + 8sinx - 9 = 0
sinx = t, IsinxI ≤ 1
t² + 8t - 9 = 0
t₁ = - 9 не удовлетворяет условию IsinxI ≤ 1
t₂ = 1
sinx = 1
x = π/2 + 2πk, k ∈ Z
4) 2cos²x - 9cosx - 5 = 0
cosx = t, IcosxI ≤ 1
2t² - 9t - 5 = 0
D = 81 + 4*2*5 = 121
t₁ = (9 - 11)/4 = - 1/2
t₂ = (9 + 11)/4 = 5 не удовлетворяет условию IcosxI ≤ 1
cosx = - 1/2
x = (+ -)arccos(- 1/2) + 2πn, n ∈ Z
x = (+ -) * (π - π/3)+ 2πn, n ∈ Z
x = (+ -) * (2π/3)+ 2πn, n ∈ Z