Предмет: Алгебра, автор: alligator02nd

Докажите тождество:
(cosA - cosB) / (sinA - sinB) = -ctg(C/2), если A, B, C - углы треугольника

Ответы

Автор ответа: park01
2
Смотри во вложении.
Приложения:
Автор ответа: amin07am
4
Решения на фотке........
Приложения:
Предыдущий вопрос
Следующий вопрос
Похожие вопросы
Предмет: География, автор: katerinaladygina25
10. Установіть відповідність між датами та їхніми ознаками: А 22 червня; Б 22 грудня; В 21 березня; Г 23 вересня. 1 день сонцестояння, Сонце в зеніті над Південним тропіком; 2 день рівнодення, наступними днями в Північній півкулі світла частина доби збільшується; 3 день сонцестояння, Сонце в зеніті над Північним тропіком; 4 день сонцестояння, Сонце в зеніті над екватором; 5 день рівнодення, наступними днями в Північній півкулі світла частина доби зменшується ​
2 года назад
Предмет: Английский язык, автор: yarioshi123
8 Read a review of a TV series. Are these statements True (T), False (F) or is the information
Not Mentioned (NM)?

One of the best series on TV at the moment is Penguin Island on Tuesday evenings at 7.30. Next Tuesday will be the last one. If you didn’t see the first five programmes, you can still watch them online, but hurry! It’s a brilliant series about Phillip Island, an island off the coast of Australia which is home to thousands of Little Penguins. These penguins are very small – the smallest in the world and they make their homes and lay their eggs a few hundred metres from the beach. Every day the adult penguins go to sea and swim hundreds of miles to find fish. Then they bring it back for their babies (called chicks) every night.

These penguins only live in one or two places in Australia and New Zealand so it is very important to protect them. A few years ago, there were holiday houses for Australians on the island which were too close to the penguins. So the government started a penguin protection plan – they bought all the houses and then knocked them down.

Now people can come to the island, watch the penguins on the beach and hopefully want to help them. When the penguins return with their food, they have to walk the few hundred metres to their homes. This walk is called the Penguin Parade! So, people can still enjoy watching the penguins, but they don’t live close to them anymore. In the last programme we will learn about Tilda, a young female chick. Will her parents come back with food or will she have to go and swim for the first time to find some? Watch on Tuesday to see what happens. I love this programme and I’m sure you will, too!




1 The TV series has six programmes. T/F/NM
2 The name of the island is Penguin Island. T/F/NM
3 The penguins find fish in the sea near
the beach. T/F/NM
4 People don’t live close to the penguins now. T/F/NM


5 People come every day to watch the Penguin
Parade. T/F/NM
6 In the last programme, Tilda has to find food
for her chicks. T/F/NM
2 года назад
Предмет: Математика, автор: BlackEyedBoys
У Кости в 3 раза больше марок чем у Димы.вместеиу рих 16 марок.Сколько марок у каждого мальчика? Срочногоооооо
2 года назад
Предмет: Українська мова, автор: innamatvijchuk
Добрый вечер помогите пожалуйста вправа 445. Очень срочно надо
Даю 20б
8 лет назад
Предмет: Математика, автор: sentall
Скильки цифр писля коми в добутку чисел 10.9081 и 24.65146
8 лет назад