6cos в квадратеП/4+tg в квадрате(-П/3)-ctg(-П/2)

для получения 40% раствора формальдегида в 0,5л воды необходимо растворить следующий объем формальдегида.......????? какой объем.

Применение производной для нахождения наибольших и наименьших значений величин. Помогите решить.

Выберите подходящее по смыслу слово и перевод пожалуйста
 Ever since he can remember, Nick has wanted to become a vet. "I've (0) always/already loved animals. When I was about six I had to take my cat, Hector, to a vet for a check up and I think I made my (1) career/job decision then.
Getting a place on a veterinary science course is very competetive. It's very important to find what's (2) required/avaliable in advance and to choose the right subjects, Chemistry and biology will help you a get into veterinary school, where you can do (3) qualifications/qualities that will (4) let/allow you to work widely.
Nick is working with a (5) vet/ IT consultant at the moment and is planning to get some work (6) achievement/experience on a farm. It will help him to develop necessary (7) qualities/aonditions and get key (8) opportunities/skills that are important for the future (9) employment/school.