Home
О нас
Products
Services
Регистрация
Войти
Поиск
TeroZord
@TeroZord
August 2022
1
7
Report
Помогите sin.cos.tg Очень надо!
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
Удачник66
1) Есть формула
sin a - sin b = 2*sin(a-b)/2 * cos(a+b)/2
sin 105 - sin 15 = 2*sin 45*cos 60 = 2*√2/2*1/2 = √2/2
2) sin 3x = -√3/2
3x = (-1)^k*120 + 180*k
x = (-1)^k*40 + 60*k
3) tg^2 x + 3tg x - 4 = 0
Разложение на множители
(tg x - 1)(tg x + 4) = 0
Или через дискриминант
D = 3^2 - 4*1*(-4) = 9+16 = 25
tg x1 = (-3-5)/2 = -4; x1 = -arctg 4 + Π*k
tg x2 = (-3+5)/2 = 1; x2 = Π/4 + Π*n
0 votes
Thanks 1
More Questions From This User
See All
TeroZord
July 2022 | 0 Ответы
pridumat i nachertit elektricheskuyu cep so smeshannym soedineniem 8 rezistorov r34ee42e9fdbc4d3b0a6442feceb9eca8 36037
Answer
TeroZord
July 2022 | 0 Ответы
pomogite reshit sincos tg
Answer
TeroZord
July 2022 | 0 Ответы
pomgite reshit sincosth
Answer
TeroZord
July 2022 | 0 Ответы
pomogite sincostg
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 "Помогите sin.cos.tg Очень надо!..."
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
sin a - sin b = 2*sin(a-b)/2 * cos(a+b)/2
sin 105 - sin 15 = 2*sin 45*cos 60 = 2*√2/2*1/2 = √2/2
2) sin 3x = -√3/2
3x = (-1)^k*120 + 180*k
x = (-1)^k*40 + 60*k
3) tg^2 x + 3tg x - 4 = 0
Разложение на множители
(tg x - 1)(tg x + 4) = 0
Или через дискриминант
D = 3^2 - 4*1*(-4) = 9+16 = 25
tg x1 = (-3-5)/2 = -4; x1 = -arctg 4 + Π*k
tg x2 = (-3+5)/2 = 1; x2 = Π/4 + Π*n