помогите решить уравнение.      cos2x=√2/2

Подготовте речь (поздравление, комплимент) на одну из предложенных тем. 

1) Сегодня ваш (твой) день рождения ...

2) Как вы прекрасны ...

3) Если бы меня слышали горы (река, небо, цветы, дождь и т.д.), ...

Пожалуйста, на любую тему напишите речь, не большую и не короткую. Заранее спасибо!

2)6.7 ·(7,9 - y)= 28,81

3)9.14z - (3.78z + 2.87z)=12,45 

Choose the right item and complete the sentences.

a) Present simple or present progressive?

1. I can t come to the phone now. I (to have) a bath. 2. The Queen (to live) in Buckingam Palace.3.Austrail (to export) wheat wool and dairy products. 4.Look, that man (to smile) at us. Perhaps he (to know) us.

b) Future simple or future progressive?

1. I (phone) you tomorrow if you like. 2. John says he (be) busy at 10 a.m. tomorrow. He (work) on his lecture. 3. There are a lot of mistakes in this document. I (type) it again in the evening. 4. I (play) tennis with Kate tomorrow night.. 5. I (tell) you what to do on Saturday.

c) Past simple or past progressive?

1.How many cities you (see) in Australia? 2. What book they (read) when the bell (ring)?

3.-- You and your friend looked so excited when I (see) you. What you (talk) about?--We (discuss) the plans for our holidays.4. When he (go) to Australia, he (not, know) much about this unusual country.