Хэлпплиз (2,4,6)Простите за плохое качество

Хэлп
плиз
(2,4,6)
Простите за плохое качество
- Предмет:
  Математика
- Автор:
  miasybeard
- 5 лет назад

Ответы 1

2) $\frac{1}{sin(a)-1}-\frac{1}{sin(a)+1}=\frac{sin(a)+1-(sin(a)-1)}{sin^{2}(a)-1}=\frac{2}{-cos^{2}(a)}$ 4) $\frac{sin^{2}(O)-1}{cos^{2}(O)-1}+tg(O)ctg(O)=\frac{sin^{2}(O)-1}{cos^{2}(O)-1}+1=\frac{sin^{2}(O)-1+cos^{2}(O)-1}{cos^{2}(O)-1}=\frac{-1}{cos^{2}(O)-1}=\frac{-1}{-sin^{2}(O)}=\frac{1}{sin^{2}(O)}$ 6) $cos^{2}(a)-(ctg^{2}(a)+1)*sin^{2}(a)=cos^{2}(a)-(\frac{cos^{2}(a)}{sin^{2}(a)}+1)*sin^{2}(a)=cos^{2}(a)-(cos^{2}(a)+sin^{2}(a))=cos^{2}(a)-1=-sin^{2}(a)$
- Автор:
  birdywzpg
- 5 лет назад
- 0
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Помогите, ПОЖАЛУЙСТА!!!

1) Прочитайте текст Highway to the Andes и ответьте, было ли путешествие Джеймса Фергюсона ужасным.

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4 Barinas is higher than three thousand metres.
5 People say that the first part of the journey is the best.
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7 Merido is 4,800 metres above sea level.
8 He tried a garlic-flavoured ice cream.

3) Что Джеймс видел из окна своего автомобиля? Выпишите факты из текста в
соответствии с заголовками.
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Highway to the Andes
“You‟re going to DRIVE to Merida? But it‟s so far – it will be horrible”. This is what my friends said when I told them I wanted to go to Merida by car.
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But the journey wasn‟t horrible at all. The roads were in good condition, there was motorway for part of the way and regular petrol stations (where petrol cost lessthan water).
There was even a roadside self-service restaurant between Caracas and Valencia.
I drove out of Caracas, and its mixture of modern skyscrapers and old, poor housing, on a mountainous highway. At first the scenery was Caribbean: bananas, small villages, coconut trees.
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Хэлпплиз (2,4,6)Простите за плохое качество

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Хэлп
плиз
(2,4,6)
Простите за плохое качество