Home
О нас
Products
Services
Регистрация
Войти
Поиск
LiraReimand
@LiraReimand
September 2021
1
21
Report
Помогите упростить,ничего из новой темы не пойму, пожалуйста ) только 129
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
sangers1959
Verified answer
1) 2*cos40°*cos50°=2*cos50°*cos40°=2*((cos(50°-40°)+cos(50°+40°))/2=
=cos10°+cos90°=cos10°.
2) 2*sin25°*sin65°=sin65°*sin25°=2*((cos(65°-25°)-cos(65°+45°))/2=
=cos40°-cos90°=cos40°.
3) sin2α+(sinα-cosα)²=2sinαcosα+sin²α-2sinαcosα+cos²α=sin²α+cos²α=1.
4) cos4α+sin²2α=cos²2α-sin²2α+sin²2α=cos²2α.
1 votes
Thanks 1
More Questions From This User
See All
LiraReimand
August 2022 | 0 Ответы
rebyatkto eshe ne spit kak eto ponimat eti vot shesterochki nad slovom
Answer
LiraReimand
July 2022 | 0 Ответы
problema s odnim primerom po algebrepozhalujsta vyruchitekak eto reshaetsya
Answer
LiraReimand
December 2021 | 0 Ответы
pozhalujsta tolko 129
Answer
LiraReimand
November 2021 | 0 Ответы
rebyatobyasnitechego to ya sovsem segodnya d pochemu k ekonomicheskoj sfere otnosit
Answer
LiraReimand
October 2021 | 0 Ответы
ne smogu usnut ne sdelav eto znayushie lyudi pomogite s 12 zadaniem obyasnite
Answer
LiraReimand
October 2021 | 0 Ответы
gde vyznayushie lyudi orfograficheskij razbor pozhalujsta
Answer
LiraReimand
October 2021 | 0 Ответы
pochemu k ekonomicheskoj sfere otnositsya razdelenie truda ne ponimayupozhalujsta
Answer
LiraReimand
October 2021 | 0 Ответы
pozhalujstaa ochen nado
Answer
LiraReimand
October 2021 | 0 Ответы
pozhalujsta dostup k fajlu s imenem www i rasshireniem pdf nahodyashemusya na servere
Answer
LiraReimand
September 2021 | 0 Ответы
help schitayachto kazhdyj simvol kodiruetsya odnim bajtomopredelitechemu raven in
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 упростить,ничего из новой темы не пойму, пожалуйста ) только 129..."
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
Verified answer
1) 2*cos40°*cos50°=2*cos50°*cos40°=2*((cos(50°-40°)+cos(50°+40°))/2==cos10°+cos90°=cos10°.
2) 2*sin25°*sin65°=sin65°*sin25°=2*((cos(65°-25°)-cos(65°+45°))/2=
=cos40°-cos90°=cos40°.
3) sin2α+(sinα-cosα)²=2sinαcosα+sin²α-2sinαcosα+cos²α=sin²α+cos²α=1.
4) cos4α+sin²2α=cos²2α-sin²2α+sin²2α=cos²2α.