можно ли расписать ctg^2a=cos^2a/sin^2a?

Сторона правильного треугольника равна 33 корня из 3. Найдите радиус окружности, вписанной в этот треугольник.

ТВІР ПРО ЩЕДРІСТЬ)))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))00

На деревообробний комбінат завезли 10 однакових вагонів і 20 самоскидів деревини.Маса деревини на одному самоскиді 40 ц 60 кг,а в одному вагоні-у 4 рази більша.Яка маса всієе деревини?

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                                The Whites Living-Room

The whites living-room is not a small one,it is rather large.

Let us look at the pucture .Wee seee a large carpet on the floor,a small round table in the middle of the room and a piano near the wall opposite the door.There is a pucture hanging on the wall over the piano.We can see a bookcase with a lot of books in it near the wall on the left and a sofa near the wall on the right .Between the piano and the bookcase there is a window with curtains on it.On the left of the bookcase there is a TV set and near the TV set there is a fire-place

Mr.White is sitting  in an arm-chair in front of the fire-place,reading a newspaper.Mrs. White is sitting in an amr-chair in front of the TV set watching TV.Henry is watching TV too,but he is not sitting on a chair,he is sitting on the carpet.

Mary and Grandmother are sitting on the sofa on rhe right.Mary is playing with her dool ,and grandmother is watching her.Grandmother likes to sit with Mary when she is playing