Докажите тождество:
(a-2)(a+2)(a^2-2a+4)(a^2+2a+4)
(c*2-c-2)(c*2+c-2)=C*4-5c*2+4 
найдите значение выражения с^2 + 1/c^2 , если с+1/с=2,5

Rephrase the sentences according to the model.

MODEL: Ann invited the friends to her party.

It was Ann who invited the friends to the party. Именно Аня пригласила друзей на вечеринку. 
1.Jane told me a secret.

2.The Vyatka(река) stretches across Kirov (город) region.

3.Smirnov bullies small children.

4.Sergey Mikhalkov wrote the modern hymn of Russia.

5.We have been learning this song for two days. 

6.Students were happy during the visit to Sydney.

7.Englishmen are famous for afternoon tea.

8.She liked to listen to Katyusha when she was a child.

9.In 1945 patriotic songs were so popular.

10. After the Olympic performance Julia Lipnitskaia became so popular.