Предмет: Алгебра, автор: Smoggi

Помогите решить, пожалуйста:)

 sin^{2}x-|sin x|=0

 Найти х.

Ответы

Автор ответа: 6575
0

Замена: z=|sinx|

z^2-z=0
z(z-1)=0

z=0     или       z=1

|sinx|=0       |sinx|=1
sinx=0         sinx=+-1
x=пk            x = п/2 + пk

Ответ: пk; п/2 + пk 

Предыдущий вопрос
Следующий вопрос
Похожие вопросы
Предмет: Математика, автор: Аноним
Помогите срочна пжпжпж
6 лет назад
Предмет: Химия, автор: maratkyzya05
Гидросульфид натрия (NaHSO4) растворяется в воде ступенчато. Напишите уравнение диссоциации.
6 лет назад
Предмет: Английский язык, автор: danil638264647
Do you love to go shopping, but seem to spend all your money on just one or two items? If so, why not consider hunting around for cheaper, second-hand options? With a little time and patience, it’s possible to find some great bargains. Take a look at the shopping alternatives we’ve come up with. Car Boot Sales People bring unwanted things that they dig out of their attics and garages to a car boot sale. Anything from children’s toys to sports equipment can turn up at these sales, which are usually held at weekends or on Bank Holidays. Second-Hand Shops Good second-hand shops can be full of surprises and are often the perfect place to pick up a bargain! Many shops often specialize in certain items such as rare books, designer clothes and antique furniture. Charity Shops People donate used clothes, shoes, toys and other different items to charity shops where you can usually buy them for next to nothing! The money often goes to help people who are hungry, homeless or who live in poor developing countries. Christmas Bazaars These are wonderful places to buy handmade gifts, Christmas decorations and second-hand items. The beauty of these bazaars is that all the money raised usually goes to charity, so you can shop till you drop knowing that it’s all for a good cause! So, next time you’re in the mood to shop, instead of using your credit card, head for ‘second-hand city’.

Example: What does not the writer say about second-hand bazaars?

A) The things are usually cheaper there.

B) The money earned usually goes to charity.

C) They are usually organized by the local government.

D) These bazaars are sometimes a part of traditional holidays.



1. What does this text mainly explain?

A) how second-hand sales raise money for charity

B) where you can go to buy second-hand things

C) why second-hand items are great bargains

D) who benefit from second-hand sales



2. What does the writer say about car boot sales?

A) A wide range of things may be found on sale there.

B) They are a fun way to spend a holiday weekend.

C) You probably wouldn’t want the things on sale there.

D) They are not popular among the traders.


3. What does the writer say about second-hand shops?

A) They are not ideal place for purchases.

B) They always sell things that have been carefully checked.

C) They often sell only one particular type of thing.

D) You cannot buy anything unusual there.



4. What does the writer say about charity shops and bazaars?

A) They are good places for poor, homeless people to shop.

B) They are good because shopping there helps poor people.

C) They give second-hand items to people in poor countries.

D) They sell tasty Christmas food and drinks.



5, 6. Which TWO of the following statements might the writer agree with?

A) Do your second-hand shopping at weekends, Christmas and on Bank Holidays.

B) First decide what you want to buy then find the place that specializes in it.

C) Second-hand shopping takes a bit longer, but it’s worth it.

D) The main purpose of Christmas Bazaars is to raise money.
6 лет назад
Предмет: Математика, автор: egor303030

нужно заменить буквы цифрами А +ББ + А= ССС
9 лет назад
Предмет: Математика, автор: Ksylia
Петя , Вова и Миша купили 3 билета на первое , второе и третье места первого ряда зрительного зала. Расскажите с помощью рисунка или таблицы , сколькими способами они могут занять свои места ?
9 лет назад