как изменятся значения sina, cosa,tga,ctg, если угол a будет возрастать от 0 до п/2?

50 б. 10 кл. Помогите, пожалуйста!

1. Выберите правильный вариант ответа.
1) Living in a foreign country can be very difficult. In contrast/ Furthermore / Though one can often feel lonely and homesick.
2) Monkeys are curious in addition to/besides/but being intelligent.
3) Neither/Although/Both cars and motorcycles aren’t allowed in this park.
4) Studying abroad can be a very valuable experience. However/As a result/Also it can give you more opportunities in the future.
5) The best way to keep fit is working out in a gym as well as/but also/besides of following a healthy diet.
6) He’s very polite also/in addition to/but also being honest.
7) Dogs are friendly, and loyal either/as well/however.
8) Either/ Both/ Neither cows or/and/nor sheep eat meat.
9) Cats are both/not only/neither independent nor/or/but also amusing.
10) Tigers aren’t domesticated and lions aren’t, both/either/also.
2. Выберите вводное слово (вводную конструкцию), которое бы правильно соединило предложения.
1) It’s a well-known fact that recycling helps the environment. Some people ignore it. (moreover/although/also)
2) Working for a charity can be extremely rewarding. Very few people decide to volunteer. (furthermore/yet/consequently)
3) Animals which are kept in zoos are well cared for and protected. They are forced to live in unnatural surroundings. (on the other hand/what is more/as a result)
4) Tom is very knowledgeable. But he is young. (also/although/as)
5) She is against animal testing. Her sister isn’t. (whereas/furthermore/in case)
6) Wild animals are still killed for their skin. Hunting them is illegal. (on the other hand/moreover/despite)
7) The rain forests need to be protected. They are still being cut down. (In addition/Even though/As a result)
8) Monkeys are wild animals. They are easily trained. (but/besides/therefore)
9) Efforts have been made to protect animal habitats. They are still being destroyed. (as/in spite of/because)
10) The factory was fined. It’s still releasing toxic fumes into the air. (nevertheless/on account of/in addition to)
3. Выберите правильный вариант ответа.
1) New laws have been introduced to stop factories polluting the atmosphere. Pollution is damaging our environment. (since/so/although)
2) The ozone layer is getting thinner. More and more people are getting skin cancer. (in spite of/owing to/such…that)
3) The climate is changing. The Sahara Desert is spreading. (besides/whereas/on account of)
4) Industrial waste is polluting our seas. Fish are dying. (therefore/although/but also)
5) Many cosmetic companies have stopped testing their products on animals. There has been pressure from animal rights groups. (provided/due to/however)
6) Traffic in the city centre is awful during rush hour. Most people use private transport. (furthermore/as/firstly)
7) Many young people decide to stay in youth hostels when travelling. It’s cheaper that staying in hotels. (on the other hand/as well as/because)
8) People in the neighborhood are complaining. The traffic in the area is terrible. (as well as/although/due to the fact that)
9) The voyage was cancelled. The weather was bad. (both/because/despite)
10) There were no buses running. There was a strike. (moreover/on account of/but)