Предмет: Алгебра, автор: Аноним

решите уравн:cos2x-cos6x=0 хелп

Ответы

Автор ответа: Аноним

2Sin4x Sin2x = 0 ( по формуле разности косинусов)
Sin 4x = 0 или Sin2x = 0
4x = πn , n∈Z 2x = πk , k∈Z
x = πn/4, n∈Z x = πk /2, k ∈Z
Ответ: x = πn/4, n∈Z

Автор ответа: Аноним

почему pik/2 не идет?

Автор ответа: Аноним

Эти входят в указанный промежуток. Получится дублирование корней.

Предыдущий вопрос

Следующий вопрос

Похожие вопросы

Предмет: Литература, автор: muktubaeadanik

Напишите сочинение на тему правильных отношений в семье 100-150 слов
Пж срочно надо

6 лет назад

Предмет: Математика, автор: tasmuhamedovruslan

решите уровнения 0,27х+х-0,18х=7,63

6 лет назад

Предмет: Английский язык, автор: alina3107alina

Task 1: Read the film review.
Variant 1
A review of War of the Worlds by Andrea
I recently went to see War of the the Worlds.It's a science fiction film starring
Tom Cruise. The film is based on a book written over 100years ago, although
It is set in modern times. The story is very gripping.It's about alien machines
from space which land on Earth. The film has a happy ending.
The acting is very good, Tom Cruise, who plays a father who is
looking for his family is excellent as usual. However I didn't think Dakota
Fanning was very convincing as his daughter. The special effects were
incredible the machines looked terrifying and there were some very scary
moments which I didn't enjoy.
This is a classic Spielberg film: fast-moving, not too violent, and full of
action. It was scary but I really enjoyed it. Go and see it if you can.
Answer the questions,
1. What kind of film is War of the Worlds?
2.When was the original book written?
3.What aspects of the film did the reviewer like?
4. ls this film about aluen machines?
ДАМ 100 БАЛЛОВ И ПОДПИСКУ!!!!!!!!!!!!!

6 лет назад

Предмет: Математика, автор: ertyughjo

1 $frac{11}{15}$ +3 $frac{4}{15}$ ÷(14,6-12,8·1,25)
решите подробно!

9 лет назад

Предмет: Математика, автор: Nikit0SE

Найдите наибольшее целое решение неравенства: $frac{x-2}{5} - frac{2x+3}{3} >1$

9 лет назад