Question

допоможіть будь ласка

Answer 1

Ответ:

Пошаговое объяснение:

1)(sin(x))^2 + (cos(x))^2 = 1 | /(cos(x))^2

(tg(x))^2 = 1/(cos(x))^2 - 1

2) (sin(x) + cos(x))^2 + (sin(x) - cos(x))^2 = sin(x))^2 + 2sin(x)*cos(x) + (cos(x))^2 + sin(x))^2 - 2sin(x)*cos(x) + (cos(x))^2 = 2(sin(x))^2 + (cos(x))^2) = 2