Question

помогите пожалуйста ​

Answer 1

Ответ:

-1

Объяснение:

cos(π/4+2) - cos(π/4-2) = -2 sin((π/4+2+π/4-2)/2)sin ((π/4+2-π/4+2))= -2sin(π/4)*sin4

sin(π/4+2) - sin(π/4-2) =2sin(π/4+2-π/4+2)cos(π/4+2+π/4-2)=$\frac{cos(\pi /4+2) - cos(\pi /4-2)}{sin(\pi /4+2) - sin(\pi /4-2)} =\frac{-2sin(\pi /4)*sin4}{2sin4cos\pi /4}$ = $\frac{-sin\pi /4}{cos\pi /4}$ = -tg π/4= -1