5.3. Oblicz: a) (cos 30 degrees – sin 45 degrees)(sin 60 degrees + cos 45 degrees) b) (3tg30^ -ctg 45^ )^ 2 -8* sin 30^ c) ( sqrt 2 * ctg 60^ + sqrt 3 * cos 45^ )(6tg*45^ – sqrt 72 * tg 60^ ) .

5.3. Oblicz: a) (cos 30 degrees – sin 45 degrees)(sin 60 degrees + cos 45 degrees) b) (3tg30^ -ctg 45^ )^ 2 -8* sin 30^ c) ( sqrt 2 * ctg 60^ + sqrt 3 * cos 45^ )(6tg*45^ – sqrt 72 * tg 60^ ) .