cos2x-sin2x=1 решить и узнать количество корней

что общего у прилагательного с сущиствительным напишите пожалуйста полный ответ в кратце

вместо многоточия нужно вставить предлоги: FOR; OF; BY; TO

The job ... of pilot is a very demanding.
We could hear the noise ... the passing traffic.
The legs ...the trousers were too long.
Hamlet was written ....Shakespeare.
There are no simple solutions ...the problem of overpopulation .
This picture ...their country house.
We regret to infirm you that your request ... a loan has been refused.
The key ...a successful career is to find a job that you really enjoy.
I don't like the idea ...staying in town on such a hot day.
The tomb ...Tutenkhamun was discovered in Egypt in 1922.
A galaxy is a collection ....millions ....stars.
I can't think of answer ...your question.
I have written several times but I haven't received a reply ...my letters.
He says he has never seen any paiting ...Turner.
Emily didn't give us a convincing reason ....not coming to the party.
I can't see the attraction ...spending all day on the beach.
Her friends' messages ....sympathy were a comfort ...her during her illness.
the spread of drugs is a threat ...the stability of he country.
a complete rest is the best cure ....your disease.

Найдите сумму кубов корней уравнения.

2 x2 - 5x +1 =0

Напишите пожалуйста главных героев рассказа А.П. Платонова "Возвращение". И Напишите мнение прочитанного, пожалуйста