1. a) + = 1

= 1 - = 1 - = 1 - 1/16 = 15/16

|sin | = = 1/4 *

б) + = 1

= 1 - = 1 - = 1 - 4/9 = 5/9

|cos | = = 1/3 *

в) + = 1

= 1 - = 1 - = 1 - 3/4 = 1/4

sin = =

|tg | = sin / cos = (1/2) / (/2) = 1 /

2. a) + = 1/9 + 8/9 = 1     Лежит.

б) + = 3/4 + 3/4 = 6/4 1     Не лежит.

в) + = 4 + 9 = 13 1     Не лежит.