Question

Помогите
Упростить выражение
cosα*tgα-2sinα
tg(-α)*cosα+sinα

Answer 1

1) cos(a)*tg(a)-2sin(a) =cos(a) *sin(a)/cos(a) -2sin(a) = sin(a) - 2sin(a) = -sin(a)
2) tg(-a)*cos(a) + sin(a) = -tg(a)*cos(a) + sin(a) = -sin(a)*cos(a) / cos(a) + sin(a) = -sin(a) + sin(a)= 0

Answer 2

Решение дано на фото.