Question

cos60° + sin30° - tg45° - ctg135° + cos270°

Answer 1

Ответ: 1.

Объяснение:

Нужно знать:

cos60° = 1/2;

sin30° = 1/2;

tg45° = 1;

ctg135° = ctg(90° + 45°) = -tg45° = -1;

cos270° = 0.

Поэтому:

cos60° + sin30° - tg45° - ctg135° + cos270° = 1/2 + 1/2 - 1 - (-1) + 0 =

= 1 - 1 + 1 = 1.