значение выражения arcctg (tg3)

 3. Прочитайте текст и
выполните задания:

 Moscow is the capital of Russia. It was founded in
1147. In 1237 Moscow fell under the yoke of the Tatars. It was Moscow Prince
Dmitry Donskoy who led the Russian troops to a victory over the invaders in the
battle of Kulikovo field in 1380. By the 15th century Moscow turned
into a wealthy city and became the capital of the state of Moscovy. In 1712
Peter the Great moved the capital to St. Petersburg.In 1755 the Moscow
university was founded. In 1812 the Napoleonic army entered Moscow. In 1918
Moscow became the capital of the new revolutionary Russia. Moscow metro began
its work in 1935.  The heroic battle
against Hitler’s troops was in 1941. And now Moscow is the largest city of
Russia.  

Переведите на английский язык:

Москва- столица России.Москва была основана в 1147 году.Московский князь Дмитрий Донской привел войска к победе в
битве на Куликовом поле в 1380.К 15му веку Москва превратилась в богатый город.В 1712 году Петр Великий перевел столицу в Санкт-Петербург.Московский университет был основан в 1755 году.В 1812 году армия Наполеона вошла в Москву.В 1918 году Москва стала столицей революционной России.Московское метро открылось в 1935 году.   Ответьте на вопросы: 

When was Moscow founded?Who led the Russian troops to a victory in the battle
of Kulikovo field?When was the battle of Kulikovo field?Who moved the capital to St. Petersburg in 1712?When did the Napoleonic army enter Moscow?When did Moscow become the capital of revolutionary
Russia?What was the event in 1941? 

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Moscow is the capital of...In 1237 Moscow fell under the....The battle of Kulikovo field was in...In 1712 Peter the Great ...In 1918 Moscow became a capital....Moscow metro began its work in...In 1941 was the heroic battle against....